Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5067078aa12286b…

MALICIOUS

PDF

70.1 KB Created: 2021-09-15 16:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac0a344b3e125182e566375fc17f59b7 SHA-1: a209b1afedeb436ee6f2ef6853c219bcc815e74f SHA-256: c5067078aa12286b9df2b832be665e1c4c38b8ae91764052dd8b46c26d7501a7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is used to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=www+movie+rulz+hd
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c87684b95---xalatolazux.pdf
    • http://unipsyclinic.com/userfiles/file/20210902020751.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413cfce5325---nilulidefovidesenax.pdf
    • http://aqcorth.specialty-match.com/upload/files/bazodavujapidafim.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140c98981c2b---zilifekobuni.pdf
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/62816947219.pdf
    • https://rizecanreklam.com/images/file/95598214022.pdf
    • http://www.rannatennis.ee/data/upfiles/files/segefuxefekezow.pdf
    • http://entryexpress.online/chapter_images/files/vukopukaganavegen.pdf
    • https://rcvizovice.cz/ckfinder/userfiles/files/gedivotitibodowafunudazip.pdf
    • http://swvocal.com/data/se2/file/femejogisofexulete.pdf
    • https://sts-cct.com/app/webroot/userfiles/files/kelimelegej.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130085e99078---70647459732.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161419aa1b4f35---tonafipudepufaxadelarufeg.pdf
    • https://abandassociates.com/ckfinder/userfiles/files/80284291821.pdf
    • http://piqiso.ru/userfiles/file/27600431451.pdf
    • http://melly-incendie.fr/img_db/paxibanopepotodugoji.pdf
    • http://madiagranitosilano.it/userfiles/files/42419432048.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/80249131769.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/13374112190.pdf
    • https://barcelona-health.com/files/galeria/files/37526862021.pdf
    • http://rmgoals.com/userfiles/files/20215146032.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8a585a2cc966446a6232e01cf5b59aff/31394073460.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b552.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB552 16792 bytes
font_01_sfnt_off0000cd69.bin
163ffa19785471386efcc4f186b433e2aeb036d51b552f37b94ddb78fc86f5cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD69 10284 bytes
font_02_sfnt_off0000e484.bin
3dd66ca08a94a44fac5e2019d5f64e268e55ac589a30265ae209f7ff59e4ab63
pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 15360 bytes