Malicious PDF — malware analysis report

Static analysis result for SHA-256 5031c86454c95e69…

MALICIOUS

PDF

105.1 KB Created: 2021-08-01 13:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 3eba7d3ea0ad9229023a27ecd4160790 SHA-1: cd1cc08b7279567a2fc293813c72012a0aed072c SHA-256: 5031c86454c95e69ea497a7a86f2140df0de7d0027ce9649ef23787837e5c0ef
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • 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
  • 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://crewmak.ru/uplcv?utm_term=tenkaichi+tag+team+mod+iso PDF link annotation
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca79b1c50c---21393686590.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/gapti4uhh5cbg4nscuikbgfg0l/kiwonojajixuwabinizijan.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/56731355484.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5cae7842e9067ff4d862e8344b8594f1/33958715339.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/42395070640.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4637faea6d---bozutipo.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/56515996771.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/rulonalabupawufilawaj.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160705f2ed4040---32932171949.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/11743942224.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/22e86c49bf5c6e3b555d297e537d9661/kogabafavomadikogud.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/7g2qsscvicu9im1k3n93l2gdbi/manenemijidixavefiwune.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/vapovirowaganerufiko.pdfIn PDF document text
    • https://turismoporsantander.com/aym_image/files/fopesuwafedoxodefifebo.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/jiwaxofiwiwuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34a0187586---logomijiroluwutukow.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/mnch55dmpmep0gp3ipscsibn6j/7365692551.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0742adaa6e773239db4ae5bdb93743ba/25566750237.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdefaf4c38a---96328586431.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i0b241jihf0cmesdgkabtie6k3/27172488492.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/tinedutumoku.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/0fc1fb13b68374d8a94e1e943d47b131/23492332526.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/gijowebepexafetala.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001226c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A83 10728 bytes
SHA-256: 62e1d9d10a29ae5bd81ceba5252fcf4e7af47c4ae34c4ebdbc42f120d6ade581
font_02_sfnt_off000152d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D1 17364 bytes
SHA-256: e736c932f208d6270b02a0c21f044242012909beff1b6ca479d5181bca84dd50
font_03_sfnt_off00018068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18068 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b