Malicious PDF — malware analysis report

Static analysis result for SHA-256 af07ad01fb246d72…

MALICIOUS

PDF

76.3 KB Created: 2021-07-19 00:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f25aca8f1533fbd79833bef863668b8f SHA-1: c056ff547ffaa3ed05bfe18e1c2f4edbe4216f3b SHA-256: af07ad01fb246d723a2e231983fa8d9224a0d9f8c3b1e086105159b52fd94dbc
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/p9gtc45t555u5mkk1mfbb3f486/35021052703.pdf
    • http://senseoftourism.dk/userfiles/file/78455131975.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083428e6cb6f---30524694863.pdf
    • http://tkvolley.pl/upload/files/45147113533.pdf
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95345293101.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/f7879fff5bd9f30a816027786114b234/24334517611.pdf
    • http://apogeeconsultancy.com/upload/files/nutijunonide.pdf
    • http://polyalpan.hu/_user/file/17883885429.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160742f7b8671f---81979469749.pdf
    • http://aarogyamedico.com/userfiles/file/jejiwojomi.pdf
    • http://dioceseofniranam.org/userfiles/file/zivemikobilar.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/k5t49jjliuj5h5asr59jfb32b0/54482339413.pdf
    • http://topoint.cc/userfiles/fckFile/20210703153057.pdf
    • https://efnnma.org/files/file/37029846309.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed9818190---vekexuvadetegiworeduxaz.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16263537456988.pdf
    • http://dcbestwings.com/uploads/files/72841296454.pdf
    • http://skyparadisecoffin.com/images/media/files/65713806518.pdf
    • https://communeouchamps.fr/userfiles/file/xowumu.pdf
    • https://samarpanbharat.org/trila/userfiles/file/filodonukos.pdf
    • http://wirheiraten.de/images/file/sizaravavaboxaravaxef.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b9a23d92157eafddd16bd833bdd093e9/zuwojinezobipiludisufe.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090923a0d7d7---pinok.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/xoxogokosuletupor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wordscapes+cheat+level+1166
    • 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_off0000c749.bin
421bc2253330eef017b910d100084ef756ad82f3a739b23069af2af83c9d5f64
pdf-font-stream PDF embedded font (sfnt) at offset 0xC749 10692 bytes
font_01_sfnt_off0000e014.bin
8019b34015e3f4e9d9ce8a8f2bf84d7214909d4e783edc17ce14864fdb67328d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 16884 bytes
font_02_sfnt_off00010bdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 16792 bytes