Malicious PDF — malware analysis report

Static analysis result for SHA-256 944cbd38998ec51f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 09:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5885dbe0ae8ee7faad8dedd76f850ab SHA-1: 0302cb347f708bf37446651e2d325024ab57b865 SHA-256: 944cbd38998ec51f88a287c6915f13fe8bb9653f0b030cc56cb81021139212f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the file's primary purpose is to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=android+3.1+play+store PDF link annotation
    • http://formpart.com/upload/ckfinder/files/kawijamukogamuzexidizow.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/36098679758.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fbc1e713c---68251402247.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/setizubumewazatagibegasoz.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/waviluwabagi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613454cfb36aa---votaj.pdfIn PDF document text
    • http://cutskytools.com/d/files/fofuvafobexodovobotovetu.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/47117200150.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/18428545720.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/31846947851.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/juvapotemebirawidexubip.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/kitozegujidaz.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/duxepidir.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/96087753649.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/50446115288.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/bitusabulitakitozukixemo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/bsujj45deeshprnnsr39s6knkn/90387342783.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/snf3kn7khoupqpulnuq32262ko/ximijebokoxaxem.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/xanigerotegigali.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/gawubuposubigovududo.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/23712306134.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/569gg1tlbppua108d1ner4pu90/gojuwaboduzoboze.pdfIn PDF document text
    • http://tano-cable.com/d/files/wegibuketidojifonuwu.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_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 17536 bytes
SHA-256: 23c9cca9cb18adc52f33c70d6d3e113419b1f033035dba858354d94e61ba225d
font_01_sfnt_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD2 10772 bytes
SHA-256: 0df50178c7729fe6218db7ee4745a67532d1c3d6bad430b748eba71516c3560f

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