Malicious PDF — malware analysis report

Static analysis result for SHA-256 930852a360a9d45d…

MALICIOUS

PDF

95.0 KB Created: 2021-07-27 01:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 36eb08bfabaadfd265505b5e9dcd3f45 SHA-1: 48f9d7d6e05ac8e4c85524efb855da6d94b7fe7d SHA-256: 930852a360a9d45da8ab12b7e7b7bfa99fc34cd88a0fb44c06f4a15cf6ed0550
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites and are designed to lure users into clicking them. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cc08f9b8029---sijitafadopazazofageba.pdf In PDF document text
    • https://reparation-mobile.net/userfiles/file/jitazedab.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78d215a54c---38121490496.pdfIn PDF document text
    • https://dm288.com/slicice/file/litamukawamupuwakak.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/79904029185.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98530d62b---88767330371.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbbd7c9193---vududibomolimapod.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/vapukilipipis.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/lonesozovegaravovitadej.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/safalitujaguvowawibonak.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/56751283513.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087292869072---pagemudoxipiragobugerof.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797cc8a5286---59830151633.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/36699869012.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a1d06fd9b88eadf4fa74ff3acbd3e9c2/vuleb.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89f011421---72599562181.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/wubufazidafufunipilu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086346a26607---82835501793.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c1ac28dfe9b6f3fa13536dfad70b26e5/tomorir.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/pt7gf1q8qo6q6otgv8q0eqon6p/rixawivuz.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9a3653d5---13055599895.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/40698151173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gsat+airport+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_off0001106f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106F 17912 bytes
SHA-256: cd7ecc64672f1e256d452c21e3b12b13a89d3b8d83739039d38fd135dbd2a9eb
font_01_sfnt_off00013ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E8 10324 bytes
SHA-256: f626d121cff45c27b52d0100afb3327653f01e22a71b7afcb72c4bd2ffbb45fa

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