Malicious PDF — malware analysis report

Static analysis result for SHA-256 c534f09214658a0e…

MALICIOUS

PDF

107.5 KB Created: 2021-07-02 21:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15662b66016805c175e4963f9e201151 SHA-1: 30393005e1062edbb6237efea793d61ea6210d6e SHA-256: c534f09214658a0e8f34a520d9e96fd52ab7aae6fc3eccf40ca7b11a5b1066d6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The PDF document itself contains obfuscated content, but the presence of numerous external links is the primary indicator of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/2992e5fe75c54ea3b043d613e925c135/30199296148.pdf In PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/7a1c52668c5a26eef6e8ef2fab648311/tadinevaxuv.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/pp52ho9g0a40ndoshi1a12fds6/wijofesip.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/27229803493.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/cd5528b505181d13b093330782f70c7f/tibotalenisaguxip.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/38dad156dded0a196c3454cbb9266887/83850510286.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/nmin82cq2nhq0e7mlguvnst50m/sopifavubenusam.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/1002486970.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/9v6otmsmqbp8kshjgrnru9d6t9/97565584880.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hi3e075bbk5hua4oed61cie1la/rumovaxufato.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/koraxadopejuj.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f1459f6159c8c9d9c110e21d8dfee6f5/76351299201.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/fenixorabeparobajage.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/jilesa.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/49b3h2o817d53u9i5i9g2js2jb/88018536868.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430141032880075.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21cfcb0e4---zuturufepepulinodenebik.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/nofodox.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0a80c11b---ruwewovupo.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d22a5971df---julol.pdfIn PDF document text
    • http://quaint-house.com/81999845336.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/k2jtqnurpe3khtpgg3c0g392ta/27706119444.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/16870026591.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/7vp6n77dqj2n9a29cmhl0amno5/53531298038.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/buwuzalig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=lsat+examples+and+answersPDF 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_off0001455d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455D 10484 bytes
SHA-256: 9726315b9974dc49dc4a882cf88b9f7c8e220fe2501c6d9979036bd0961dcda5
font_01_sfnt_off00015d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D38 16716 bytes
SHA-256: 0fc4716a4555307cff00956643e69e6573b834fc6d3ce7acef2232758e4d7966
font_02_sfnt_off00018892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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