Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a35e1f656f3cb9…

MALICIOUS

PDF

91.7 KB Created: 2021-08-29 23:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a57e65051fac1521c27a0d85201e3b9a SHA-1: a26e388f87ab7cc60588b9144465a52c9dca28d8 SHA-256: 63a35e1f656f3cb953f46674e8722c56579b86f22f6885124cdb3169817219df
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or further stages of an attack through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://burragebrothers.com/demo/jolie/beta/userfiles/files/biforekenaletorarikaxopu.pdf In PDF document text
    • http://stlukesmn.org/clients/17773/File/lukovirilezeponise.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b74a9b55e3---tikukosogix.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/76281877438.pdfIn PDF document text
    • https://ptogel2.com/contents/files/18989880759.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/32475855534.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/43a0aabb1fe1a7cebd19b64ca5d13645/76752064631.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608225276a176---90410981460.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/26150654440.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c49339b07b8---muwelijowizoge.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a0f29477a38---bedigivirus.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609234dee58b0---modadumobevewifazed.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d9547e81472---livanenakunavigipineb.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0612eb18---81406966366.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/40672027634.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210824111622.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/diwilenonimowit.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/63020001994.pdfIn PDF document text
    • https://clinicscrm.com/img/files/93459028235.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608020def2a27---kopulojutajizofunup.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/57943814220.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dcdcc873---ziforiwoxilirilonugafi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611d432544399---2007235615.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/1267a3b9c483fa06e58fcce69e5d4562/gufuwezaw.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c779db30b31---15805424037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=five+levels+of+environmental+organizationPDF 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_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 18132 bytes
SHA-256: 870756275193f21c4207f1fda932bc747c6ff1eccfb144a5880b94b3cd1c2fd9
font_01_sfnt_off00012f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3C 10660 bytes
SHA-256: 7910b54357de240b17ebae32d6f1f8745a3a88380f90d26574bdae69b42a5494
font_02_sfnt_off000147b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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