Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a352fc2139fecce…

MALICIOUS

PDF

94.1 KB Created: 2021-07-17 15:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95b81f2f7c9c77fac0b2fa8ac547bb44 SHA-1: b91ee1ee55eb92be0db1c341f5ee026b26579537 SHA-256: 3a352fc2139fecce940f1ab802702493e0deb39d8e3818d310619d8bd1f79d85
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting an attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to deliver a payload or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c4acf8b9a0c75150e5ba7c8a2dccd3ea/33767662018.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9eccf29c---xamofitifa.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98c78adfe---jefifipilifivof.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/fukimuvadovokefi.pdfIn PDF document text
    • https://mondialardesia.it/file/kokevixuzexarimavon.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/8097789249.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/57236664860.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087234022597---zilofogova.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/ripusakesifevezapekun.pdfIn PDF document text
    • http://jarosi.hu/files/file/zagusugizikupalavilox.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/sadolotum.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/931674eb1a5d10e1e375fd5fa5dfa6c7/mijeti.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/cded44fdc025bdd1e0621285306425a5/gotowerugakexozemejudut.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090c18c5268e---34509661433.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/5121690243.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/vewigiga.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/rokewefotolepek.pdfIn PDF document text
    • http://contactconfiance.com/files/files/jifusapesatu.pdfIn PDF document text
    • https://33mobility.net/uploads/files/relowotod.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c9e0346fd---wonufut.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3d2028faf---46311872181.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/tevub.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b5bb3706e---820680336.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/46815796391.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9333aaa12f---20159380730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=am+i+trans+or+is+it+a+phase+ftm+quizPDF 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_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 17108 bytes
SHA-256: 03c10f0c8d361a7306f98e63589b9d57aa858f7caf4d5d74e058e3b62fef2d9f
font_01_sfnt_off000139c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C1 10864 bytes
SHA-256: 0cb5e77521a4773ed9918e6d8025abe23c2bd7036c16f8d535a16baf54c9c4bf
font_02_sfnt_off000152b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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