Malicious PDF — malware analysis report

Static analysis result for SHA-256 b875f96efbd4bb82…

MALICIOUS

PDF

85.4 KB Created: 2021-09-04 07:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1721ef1136a64ccff2c2981aab901d24 SHA-1: f54c328775f7672e97f26d01f0a74e5cb3b6ee33 SHA-256: b875f96efbd4bb825e594c81d8895a1255843282c7854d8dcd23da33bd15c249
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a callback phishing or tech-support scam. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting an attempt to host malicious content or redirect users. The presence of a 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number under the guise of a billing, refund, or security issue. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://laborke.ru/uplcv?utm_term=insider+threat+training+pdf PDF link annotation
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26123a1819---30657123587.pdfIn PDF document text
    • https://redac.ch/upload/88149819204.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/bf901148ba0fa29fe2678f29709895a2/wulojidaxidowubava.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/81110366252.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/cfb59694e83fb25d6c15910f0b10fde7/60129314173.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/zatirewuj.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/1137382941.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125b24a2aed8---rojegexurina.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/7raalqijatjrurir3t9ntjpu84/30420832905.pdfIn PDF document text
    • http://vipdiler.ru/files/file/borazobawibopig.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/vofirevudima.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/96184304660.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608f19eb3c56e---30988915255.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/64540964918.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/43152210224.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611e121659e2b---2890803188.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/48d6834c7b7bf025b2a97af485140f21/dozijejixon.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/89416728012.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/soktpeavr9g0rmb6gs8qsrfja5/sikanosomuzogigaze.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ba6f57a5f0db875904ee018ae2a0da60/tikupaguwarilezopo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd85d246eb---naxemabokavarugiku.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d93c492c1---17997915289.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160960229cf277---63344528790.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc43d923de2---bajebisiwar.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_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 10560 bytes
SHA-256: ebfbb9644e3c0f15d1068a83859a2a4690f308200911ef7f7c4b9063dd4960c1
font_01_sfnt_off0000ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 18448 bytes
SHA-256: 70e4e817e056bd1a756cb365f686ce4c61a00a27a3004b0eac47efab2bcd6553

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