Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfb226670408e52…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 23:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2818371d888a5cb54e0878d847c9f01 SHA-1: 5951362fc9d5a5585218e533d2657519171b5ae3 SHA-256: adfb226670408e52a7b64c6a45e991d077ec558f662c80afb505477698be05ad
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including a link farm pointing to compromised CMS uploads and disposable hosting, as well as embedded JavaScript. The presence of a QR code lure and urgency language further supports a phishing or malware distribution attack pattern. The ClamAV detection and ML classifier strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=qr+code+scanner+iphone+7 PDF link annotation
    • http://autohondl.cz/userfiles/file/xobakaruturisimegodan.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/giwabifuzus.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/bipinusodewoludes.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c3123d6de15d1eb5235f89ed1c051be2/tekeburadeves.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/44388303393.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/40454030735.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312b762dc81---nebawisofakevi.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/gudopinetax.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614111ab5b82f---batidekafelefagolomok.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/bokowuwasezesez.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/jemab.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/menerigejuka.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/mb3g33fh8nhebe1l4ghapnce34/loliritabisizuxibaru.pdfIn PDF document text
    • https://polandpools.com/contents/files/devoruwo.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/3979744781.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j687totd4g15h8o11hqgav5bqo/58850878446.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/94143408771.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/91747679792.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/78157768456.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/gevumejogimofedusera.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/42323906462.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/28384374361.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161360f16b0a6d---potipedupivojofedunexix.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_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 10576 bytes
SHA-256: 56dc95a63fc78ddebdf39f60e76d098cec65d49576444ff9adf146db7a3eafe2
font_01_sfnt_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 18228 bytes
SHA-256: 7bff95731973b5506b8a18e97f781092a00e781f060963d711381f49995061ed

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