Malicious PDF — malware analysis report

Static analysis result for SHA-256 9758929153f2867c…

MALICIOUS

PDF

70.5 KB Created: 2021-09-02 02:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 82c63423b26f75529c5895b947277b25 SHA-1: edbeaa994746b7fe4fa35cf3691ed7ba3f524eea SHA-256: 9758929153f2867c6bf89286de391786a1869997f63f8ade5ee85462805b10d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d8d3b571ad65403b50573ec8fac0ab38/datewirubod.pdf In PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/be560a99cee45aeb56fc1548cdc7a638/98722394161.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/98167746621.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd129c25f6---3341528825.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/dajegavejanofofa.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f4ec7077ff8e7adbfce031fed1fdcd21/62824487029.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/garawa.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/balaguzuwexuka.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/26580513781.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af93b2cf789---26428878837.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/68933150046.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/77655e8bf70f8aec43213beaf000ca17/rafudurelezopanaxetesitap.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/godaso.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2410c4abb0f28779520760f90605de14/zumidivikid.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/suvaxujuzitexadir.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35991392369.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f18e3a982cf5b30a2e2e589303c05953/60741645431.pdfIn PDF document text
    • http://bienbao.org/uploads/files/jarizatalulobusabosov.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/9172d188357419fe1265398fba12b118/91203608502.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/nujekidogojipujebowev.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/80136356964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=balancing+carbs+protein+and+fatPDF 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_off0000b615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB615 14532 bytes
SHA-256: 3b3354b09e26346fb8e599ed082705d80659569cc57039ce5ef671a95e9eed06
font_01_sfnt_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 10988 bytes
SHA-256: 78433201a0221f8a1baf9f7ba0cb089f659635a2124e0dc914713c27d92c2f7f

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