Malicious PDF — malware analysis report

Static analysis result for SHA-256 634cb9fae9e60a8e…

MALICIOUS

PDF

102.5 KB Created: 2021-09-02 00:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4c3d2330d8b191c856d8007700607c0 SHA-1: 4635843ed6b3017074ccecc21fac34c711b3c2fd SHA-256: 634cb9fae9e60a8e9f1b4bc1f691db0fed2a9bc6092f51f49020b011e1541624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to compromised websites or disposable domains, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=virtue+and+vice+list PDF link annotation
    • http://chornakorn-packing.com/ckfinder/userfiles/files/gadujo.pdfIn PDF document text
    • http://herve-coiffure.ci/files/32703175597.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/52719573651.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/7973b54dbce046e0ef21ee35ed5d0dee/rusetarenoxonofilebor.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c42c09fa17eaf584321ff09e187e145f/tifojoxomepegap.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/dezanozozabutavuz.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/mapaduvuxog.pdfIn PDF document text
    • http://tele-video.ru/upload/files/wotinalogiripivune.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/37e0f075887eb117111a1d45d3a6cdd0/37090068737.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d824b08bbc---19745954019.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d35584150b9---78595605883.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/wuxubo.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c28def770a418d66ec20d6b0a4649e85/12794394681.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/44021826411.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aafe0e19d---lekonazitubamapomudeju.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c31f6f7ad2f---fifexolo.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/43414364287.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884a615b831---70593299118.pdfIn PDF document text
    • http://robbes.nl/media/files/gisolep.pdfIn PDF document text
    • https://coluer.ir/documents/file/18482739213.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/35897552701.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/582417075.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5sksit8nq8mbi1h5s24sab54n6/samopiwuwajisuvoporeb.pdfIn PDF document text
    • https://irantruck.ir/data/file/89695850933.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/mozesolububam.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_off000129cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 19168 bytes
SHA-256: 665be4ebaaf7f6a88663c528f629cb1efb8780c86e5b3818c48f4446da7d668d
font_01_sfnt_off00015b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001738b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1738B 10376 bytes
SHA-256: d565f2c7ec577b69180996446ecbdd82fc11c3beaff61b6c17fca8e088c02d09

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