Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8a6c77d9b09f59…

MALICIOUS

PDF

102.8 KB Created: 2021-07-03 18:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c79183b75ae7d25c8a46f692c3270b1d SHA-1: 1aec76ec44d911904aaab0851e41f458d5f42603 SHA-256: 3b8a6c77d9b09f590a7eb408da67cd5ec34fe7259f967914e58a06a5a7f05886
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://chcial.ru/uplcv?utm_term=how+to+make+a+trident+fly+in+minecraft PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cg7nd0320pi8cgs0sjnnub98d1/7821099074.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429190337615242.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/burisavowejitibo.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d5d2e44c---67217065332.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1df32d9707---bojakokoraropon.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/19d97224a250eecde7745ffc5ebe6bc4/35346884820.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/51430409794.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f167b3635c---62339445929.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/50287461863.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/61382115186.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210501032614176.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89d058ec0c---mapabugizofujomube.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/9752272779.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ac2559059e2caed1ce54a21b62b52819/pixipafesemonugalabozasu.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/33056729899.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0c361a9f---46086428361.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad434797b726aed1908ad3bd87142b31/kitogepirixemefo.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/4808e9de2f6b08d8da28745955312280/84295777159.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e38863f398e4ca7ef36b295a9c68784c/wofuzejegoja.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4f18cbb8---tajesafoduwi.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/viluda.pdfIn PDF document text
    • http://focostrade.com/files/20210702160427.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/68389590267.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_off00012a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0B 19200 bytes
SHA-256: 2e68c983738561392279d4edf8a3b4420701d3b965bcff6e5a2948bdd6e25f04
font_01_sfnt_off00015ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17500 10752 bytes
SHA-256: 4f504876b8a52ef24d7d713fdb54b1554a45d3a81b97b12289e676edf862cbce

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