Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53117ca97b7d600…

MALICIOUS

PDF

95.1 KB Created: 2021-08-28 13:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7bd709d229da7770e5658efb2d39e77 SHA-1: a9e48f1907c34f74ac45b958fcbae681413867f5 SHA-256: f53117ca97b7d60088ac89085dc3fb641c79f458203b1efa2b7d8052516df251
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://wastran.ru/uplcv?utm_term=promulgation+of+law PDF link annotation
    • http://ladispensadicampagna.it/uploads/assets/file/44464074083.pdfIn PDF document text
    • https://olterus.com/contents//files/15724229973.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/bimizupezusewebemis.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b184c201d4d---zaruxabavugejel.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/kukisudiduxibubixiwejo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16092d329e1c12---tabusozujakimegis.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/befenore.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/69107386177.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/49c3c48939b4d4a47c8ca30b55da28cb/wibuvet.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/27218355167.pdfIn PDF document text
    • http://df-foundry.net/d/files/kaposuvixiwijirawu.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/podewozanasosul.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/e8602c0284912ea0f9dada51d0a54e68/64674348373.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/navarelatonarirawe.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/44264954937.pdfIn PDF document text
    • http://allycatering.com/userfiles/wamejemuxir.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/vivuzutije.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/mizugofoxuwinisefalilav.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/96202579316.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/guwopisiredeka.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/rivedirinigapej.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070327adff95---57292819831.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b79873aac8---19834490251.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ec207d065247858556a106f00e4d7371/14255077153.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf76166b2c---89582171594.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_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 10444 bytes
SHA-256: 6b98e93202bebd49a3185d3a08cf04886fd134259da10627c01b5f48fba9117c
font_01_sfnt_off000122f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F9 19316 bytes
SHA-256: 8fdb5b645ecd471173fe42a366bfa3cffc940908fbc8d0f3e473fc48aebb5d19
font_02_sfnt_off00015557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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