Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5145e9f2353c7f…

MALICIOUS

PDF

87.3 KB Created: 2021-07-17 12:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a5c8b7e7135fe1e8d4cafb6184339767 SHA-1: 77faefbb9679e6af5bf999bff03bf0aaa05bca03 SHA-256: 9f5145e9f2353c7f08aa2123fee6d1b7c565c9bc8001e53952dfed8a88da025a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings strongly suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/18277f95230102ecd0d478efb98f4900/fiximen.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788ac9ecc50---33787301052.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/0eb9dd4fc6b31efd70bff8a0e736c972/munotin.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/wunozuradenegataletujaf.pdfIn PDF document text
    • https://pmms-online.com/assets/file/58263056514.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/75866807744.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b11ee6c8967---73584778376.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160844378a20d2---76147214634.pdfIn PDF document text
    • https://airbays.com/userfiles/file/84569683376.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/fapoputasoxupurerenek.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/fapawuzij.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ee08c8c5f8d341920c54d0af712723f7/radagijelo.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/78889810420.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1105572781---3773303084.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf62a7a5e---7130683903.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/81919805154.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/73d65f835077f19b06de7c42e43892f7/wiwij.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/56107036388.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/54667641647.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/glkpac6g3g11k180g0qp0v5gt3/11361855013.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d341b4abaa0b36cd49395a45a027cf69/77147223477.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/fibawimenimubit.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5bab46feb47b04e4de7fabb346c428a6/mobowonezirasafesujam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=online+boating+safety+test+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_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 16232 bytes
SHA-256: b7a7a646fae9632d3f813b973edf60727968c4af9356d59353929dbc7184afea
font_01_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 10752 bytes
SHA-256: 62a972b6d50e3f6981425055df425cd9747dc552658b27ac5e240b2e466c9227
font_02_sfnt_off000137d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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