Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e80d13923095790…

MALICIOUS

PDF

82.6 KB Created: 2021-08-19 16:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1086eff6d9db74ca3f12d17cd551b5b5 SHA-1: 6c45ec86e7da8a07347d0c4820dffb979ea557b2 SHA-256: 8e80d1392309579036e8a7cd2f8521d1d2684d4e558e92fbf7e7809b612d8bfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS upload directories. The presence of a URL with a 'utm_term' parameter suggests a potential phishing lure or a campaign distributing specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=five+nights+at+freddy%27s+ar+special+delivery+mod+apk+download PDF link annotation
    • https://madopin.com/calisma2/files/uploads/16064736176.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc4d4db7e9---kebosenekevedirokofa.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e9ddbb9e0301ac27967e93ef0963d3b3/virizegivugabotogo.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/xojarowuvapotoxabigotope.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/5254417823.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7484e3cd55---74837931989.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/bc629881615fb40292f50f3012c2fd1d/tofisewusomi.pdfIn PDF document text
    • https://kartplast.com/resimler/files/9496921743.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/16127601864.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/98352789849.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e8847f27a8ed9cf0aa23c9a0ac50239e/lotebeligefesojobozimik.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/xatokelodutunigot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382751280d---duzumugorikatavuji.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/07de3fb03f7eaa6d9ab232199ac1e453/gofuwugejozelugomumiwak.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a5683e7d527---xuwegajufalepodavogawi.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/4diec2eehh7v44hp2nn04oij7n/67828652503.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/rigimonipanu.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/dejewasodipipuxasigukum.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/fixefet.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/11429041710.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076c00c0c57a---19558482723.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1058ebb7e---68849588717.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/85067635571.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_off0000d9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 17256 bytes
SHA-256: 9fbd2893d7caf77d8dd76ab4f582166b69f30142fb84084d3797c999aa48ef88
font_02_sfnt_off00011eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 11436 bytes
SHA-256: 3b6da7495348867f93ca24b02f5914de68481f354ba6ab95a1ea89f5ee8fa460