Malicious PDF — malware analysis report

Static analysis result for SHA-256 5771fc4ff42b2b81…

MALICIOUS

PDF

89.4 KB Created: 2021-06-27 22:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 61f8bf81da50a7b8e937fff677f0a294 SHA-1: d6f6b22884c900b401489434073e6feb9b03171d SHA-256: 5771fc4ff42b2b81d54ddb4b70e623cb1e449bc0a6da541ab548cce856a61fd9
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs social engineering tactics, including a fake download button and instructions for handling password-protected archives, to trick users into installing potentially malicious browser extensions or updates. The presence of numerous external links, many hosted on compromised or disposable domains, suggests an attempt to distribute further malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=how+to+send+pdf+file+in+mail PDF link annotation
    • http://mjacz.cz/soubory/files/zutakuripujefegisuxip.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c585c2729---witorivelukitufar.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wedoxemegadipuligidozenag.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/013865717d6c7d7e4c9a78d081a23739/39904803245.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adec5e72a5---45891893493.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cde8c820cfd0b1cda5d258d558bd731b/39323042958.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/mujoxalozudiso.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/df35608d83c46553a8d4b08fe52c352f/rezulagevunim.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/tapevegeki.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c7100015b1b---peleduwakujofuf.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160894351a7c3c---6680643444.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/9qkk2r7csq9m43om6amkcvim81/vikorewixo.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732a7f54629---50123795861.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/8117b9baa177f5855cecf5b5f83439a7/81082042123.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/789134ae475e1d6afffaae469b0c69a8/37961817896.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/d5skthg0ptapda7f5jb14ens2n/gubanavuxi.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/232fda395e6f860bd47a5a89f501cd1f/51529726280.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/84850257350.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796c2ba940a---79419131395.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/7279099980.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/5rnd95k03sid6ki10hoej1jcv9/nepoxajozimo.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/635799641.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f00e8d7d4---80380508814.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/90745750604.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/zuzolejapugifubidit.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/91a680bd94ac85121d3712fd049f0011/65279946031.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 16916 bytes
SHA-256: f5af063f40348b28456c8c65127dd1a5106434f4efe03a920039d5037f22c1e3
font_01_sfnt_off00012663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7A 10636 bytes
SHA-256: 0daf55e754f9581b184c130d549b97b50d494bbaad976f942eb144f20ef92780

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