Malicious PDF — malware analysis report

Static analysis result for SHA-256 905094d83c9d1619…

MALICIOUS

PDF

88.4 KB Created: 2021-09-24 10:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1462061986e502da450726aa306857cd SHA-1: 8dd114c7eb4f946a0dd2a553eff3979f7c3092a6 SHA-256: 905094d83c9d1619a3238af7c2697c80ee808c9e206395d1c8ac40b14435eedd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to lure users to malicious content. Heuristics indicate it's a link farm and ClamAV explicitly detected it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged it as malicious. No scripts were extracted, but the primary attack pattern involves directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wct.goldcrownresort.com/magazine_files/files/sowozojoma.pdf In PDF document text
    • http://clubesquilacoma.com/uploads/files/83916669495.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/lavovozonafazubepegenigu.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/wabuzivalizutevoxezu.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/34724694052.pdfIn PDF document text
    • https://alariel.be/userfiles/file/80327454911.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/bumepawerumimu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161434f2d66f6e---monedewinanuj.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/44656415535.pdfIn PDF document text
    • http://hanifeugur.com/image/files/jupekot.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/dapemof.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/99285445303.pdfIn PDF document text
    • http://annabarons.com/files/files/felamapuzilidixuv.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142fca520065---15935178168.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/68766088189.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/muwiwutezagiriwiviwi.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/vanirubelivetaxulek.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/37096641033.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/72104089633.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161316b1c5aee6---36091660442.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/12522198884.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/55443797544.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/55293182220.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/luzawatazubitojogavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=neon+light+live+wallpaperPDF 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_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 17788 bytes
SHA-256: de915b19cb3f701a2888592de30119c7296fbe1d1cd097a356b416e34bd569e1
font_01_sfnt_off00012456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12456 10492 bytes
SHA-256: ee85368889fa84f062d0e548b60a0a572c4708b816a65c6aa19f34229fb83227
font_02_sfnt_off00013c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1