Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d1b2a73e0d63f1…

MALICIOUS

PDF

73.0 KB Created: 2021-09-02 08:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae5cb8d0f91ae54b199f17c8b938f1f5 SHA-1: abc40f2ecb2e675ba10c7f051bd1ebc556a547b9 SHA-256: 92d1b2a73e0d63f1e1bf68d7b85a0d718ebf1e19deffacb25db7d879ec6de581
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. 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 0.9992

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://crewmak.ru/uplcv?utm_term=find+the+cosine+of+an+angle PDF link annotation
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b78d2997ef---bijejazitabu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7f55852d7---42871870700.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/84412781747.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/20868387482.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/fb7cc8a9fa3184cb045db573d41b837b/62999930667.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/370697119d815925f6b78c49a7cfbb76/gosorotasozagililoxebi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f31a2f577f8c70d73937a00cd60f9120/83708231085.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a84700dd35f---zalukonamidutetifufu.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/22115720796.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609256d1d0191---11899914868.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa85cd1ae0b---59534128694.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/9820185e7k85qn8l97mi572hvf/20817629490.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/31665216453.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/78107244993.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/pokoxufazadenokemanufasu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609104a815ca1---82435249903.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021081021592373499.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/xozuke.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c01d6a2e8---faviwojidu.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/90246024129.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160745a24db45c---rowuzidonixagepa.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/46204771767.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1ceb18d916e4daaf2f57d9a9c68b1b5e/wazobata.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/38thtoc7hit50vob1bglsqefes/fatetuwem.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_off0000bd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7D 16020 bytes
SHA-256: 83467b68faab4802b290ecfd64d201f78c92a105d64153de5b532f4207ccfe8a
font_01_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 10632 bytes
SHA-256: 7831f80ba7978bba6cac9f99b8bc3cf9f49b18ea96891657b1bfe4b7b9cc14d4

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