Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ec7a5eabb26d42…

MALICIOUS

PDF

76.1 KB Created: 2021-08-27 22:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 955f92674f644b612ba85a746689e7ff SHA-1: 6cb4ef3fee16938bdd080c6e4276a0d2c72c4266 SHA-256: 76ec7a5eabb26d42cb60992886513b370824903847d0189f27f46bd7bae17417
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised websites and potentially malicious content, as indicated by multiple heuristics flagging it as a link farm and containing external URIs. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/e8gn3c65p7oano4ai1m2apa208/menepuwube.pdf In PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/98601985233.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c88173809f---74228501311.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce339eb71c---8416603189.pdfIn PDF document text
    • http://metapolar.hu/tmp/34831663985.pdfIn PDF document text
    • https://securitydm.com/slicice/file/fulerufoledirepegaloreb.pdfIn PDF document text
    • https://chp-travel.ir/data/file/toleberuxenogawile.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/qlb0ri0trgpnks18m4d9v3gllo/mokagosofosujoworazurup.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd8c22c56e---67606670437.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/97009748039.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86011686496.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/31cf39007808d9bb8862f04cd4e2eb6e/jufikizuxalawavamojobeda.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/3d3ff433628b35d3fafb496948adfe89/68481496785.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/86243537006.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/vadedub.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/9293928464.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/270b5d55729815a41e102f25518ab68b/tizaxozone.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/dakupim.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/31678683850.pdfIn PDF document text
    • https://kawanmto.org/contents/files/denet.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16114da236b8db---dakota.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9627ea0b9---8352037921.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/44281308558.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/13117745542.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/gogureg.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/95292878808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=girl+names+that+sound+good+in+english+and+spanishPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42C 17616 bytes
SHA-256: d855729d15ec802cee625a8a7defc390449d5671ea1f2062d6f0fe1bff912f9d
font_01_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 10980 bytes
SHA-256: 0bae21d5dca6fcfddd4fdfb3e1e7dfd453acecc07ada883a17c9e1cc9b00dc12
font_02_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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