Malicious PDF — malware analysis report

Static analysis result for SHA-256 36584fa84185cafc…

MALICIOUS

PDF

104.9 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: 9ba1700bea792c7ff8c0849b21b0dd93 SHA-1: 20dfcd8c6a108b371215ce82d51fe8cd74d218d9 SHA-256: 36584fa84185cafc2cdda94097e6bd45382dfa753c508c7ced18ddb6599c251b
126 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The file's structure and link farm behavior indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.1425

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://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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