Malicious PDF — malware analysis report

Static analysis result for SHA-256 f278810db00b583f…

MALICIOUS

PDF

90.3 KB Created: 2021-09-03 06:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df7694438df5143d794d778f29fb4e6b SHA-1: af2abc08223253907429857d6f160eef084d6d48 SHA-256: f278810db00b583f61772333ef5d005ad803c51f89b5bf7a5a305970cee70e16
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It functions as a link farm, containing numerous external URIs pointing to various domains, some of which appear to be compromised or disposable. The primary purpose seems to be directing users to external sites, potentially for phishing or SEO spam, rather than executing embedded code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://beamstraffic.ae/amb/userfiles/file/tadokodopu.pdf In PDF document text
    • http://maility.pl/_ADRESuserfiles/file/vumibojapum.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5b8013323613156069b9f5e3dc7db7c1/89559880563.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/kofoxazusavomedexavefu.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/18932612058.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/defibi.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/56944165724.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a42c44b832b---40899025147.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edf0c22ae4---belakirevubiziwagofo.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/86714167754.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/wejunizewulotufawijun.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/dd2cbe2c4fc981b189ea4cfc5354904d/33893275569.pdfIn PDF document text
    • https://alutat.com/data/file/jexusinewogibibokefe.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/47ia7qi8g5fb0bb4mkq7gpdhg9/mumowa.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2aac36ff0be12328f2000a37947cccbe/sotuses.pdfIn PDF document text
    • https://ville-rouillac.fr/docs/file/sipuxetilo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609817f769e61---beneledo.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cb2a4772f---figagogakiresefu.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/91055720551.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87b917944---42829792183.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d095a2cdcb0276abb03db006705b1d66/93026804657.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/gixiwubebaxa.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/42720692770.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/d6b70436348534db2e84ddc26760d6fd/gotalirepezubigufa.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/vubufezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=le+droit+administratif+marocain+michel+rousset+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 21072 bytes
SHA-256: 4a26dbd755c83f9ba4f823b10f48ab30faf298813101a6181d16432a666236e9
font_01_sfnt_off00012804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001401b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401B 10940 bytes
SHA-256: 3f260afb7d87d886f0c72daf9a15ef1b5bbad5900f6e5b2212f947aa9a912f7b

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