Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6531262de668146…

MALICIOUS

PDF

105.8 KB Created: 2021-07-21 00:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: de14e7df4d4291fac506f9970c55c494 SHA-1: c4b3bd1460910e4879ebbcba79e2788dabaf0469 SHA-256: c6531262de6681469387e74b7df8495e831a4dad1fde0db1fa6e92914d7a2b7f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://sanmuabancongty.vn/images/content/files/54586908700.pdf In PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/sodimijakuzasirife.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/37e0ffed20dc5c7835bb2a8218b98338/99134987277.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/weneradasetemixibokix.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c10899d2cc79c423a6351992fc687ef6/jekisagaroka.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a6254b27---20980730982.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/4c19dbae1bfc6b8a8a82a000b81df0c9/tafujolakukokaponojat.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1f6lq5b7s9rbt17v8tnraubq4s/petamakukas.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160befef7194f3---lenojasavowesumizunawobij.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a38e5b604fc---vapuduwupikanozu.pdfIn PDF document text
    • https://synersys.fr/contenu/file/gagiwugawedipopaxe.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/dcc4ea63372e9430f93c89cd0ff4280f/sefunu.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1ca7e40d31b73de3d3c6a7667088ef84/28645130264.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/87421848023.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/zewusebevajeserukexegobaj.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/85f9da3b9cf6b55f27cbd4c34366543a/fojaxugo.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/95845617153.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8c083d5d3---vuwutebujagadunegemonag.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/xelufegadokena.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/tunovobiwekaduwirobafi.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ddaede72f44bbbfdcb4eb84be26f30bd/tajawobexewub.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/1618fbd16b0dd2da9782a2e58ebd2819/70603299024.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052920555263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=crucified+before+the+foundation+of+the+worldPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13774 19432 bytes
SHA-256: 45efc2bf9b6e2692d5d0c4897876989c185ceb9887f835af86a0f2936eb98675
font_01_sfnt_off000168db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168DB 10764 bytes
SHA-256: e6bd5e59616f07476f90deed78d41114f6601554a412224ed9c45505d1fe0680
font_02_sfnt_off0001819c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1819C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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