Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffc464b1f43f28c…

MALICIOUS

PDF

87.2 KB Created: 2021-09-22 23:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e60e38002b3abb812e361a91419f585 SHA-1: 8f49fa7db9716b8691f6b2ad4a3511a966b2e877 SHA-256: 1ffc464b1f43f28ccdbecdf5743fca5ee91e22c12b335b06dabed4dad5c93960
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://medvor.ru/uplcv?utm_term=top+strategy+games+android PDF link annotation
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/mavuronedixozipuxotuzizil.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161491ef7b70d6---14339510556.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/11787468878.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/s0tmiricl0dpghgc4a8h7gecgm/41491047125.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/liwuregofumafusiguniwazaf.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f89dc4f8---somenekase.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/93809945674.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuxovelilupepamifigonujur.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/riwuli.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/27920239541.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/soxibolu.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/92403610229.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/79343437164.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/85a663fea21adcea732faab6b32ddb17/15772977144.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161364fbc7ff00---kitokedizezukima.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/kewizojekazenavigut.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/44633531813.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/jejipo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/u4nabj0cs54hkto90t3qihkdur/bimanos.pdfIn PDF document text
    • http://willbramephotography.com/likezotisafelelut.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/95134036447.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbda539143---35721983134.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_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 10768 bytes
SHA-256: 75d5210574c2b60831a443dfa86851e799e3dd59b10d8f35c84e9a52a1cc07be
font_02_sfnt_off00012431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12431 16760 bytes
SHA-256: c7d04562facfa21d43b34bf7dac1626da7a9e27396a2abe18f2c9cba2b37cd16

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