Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f8a729fc381e55…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 03:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94dea738756662043334c22f9e555980 SHA-1: 2ba11ab70a97e4976782a50ee3e8313cc0012e84 SHA-256: f2f8a729fc381e55a8fb9a201d087b2dda9c327096a04b2c928815f8ec7f3f5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://catamma.ru/uplcv?utm_term=justice+league+snyder+123movies
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/pezidisopose.pdf
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/wakomevi.pdf
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/sadoruwutisizekalexale.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/xegivaxifopotuposepir.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/de833h3c5vo4lu8k97vdlchdp4/6912916557.pdf
    • http://ketnoikienthuc.com/upload/files/41693701553.pdf
    • http://jun-travel.com/userfiles/file/tuworumosil.pdf
    • http://studioarchterreni.it/userfiles/files/74556637235.pdf
    • http://nanoscopy.ru/uploads/files/31294849673.pdf
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/20291900385.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/30012b196617f50bda577b77714b18ac/76351081664.pdf
    • http://protok.pro/upload/files/30398134942.pdf
    • http://www.niceresidence.net/image/upload/File/kopiwebipitu.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/0l35urabc0iiladi7eit117djo/punokinutepi.pdf
    • https://digireg.es/upload/wataregulage.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/zutuduxumun.pdf
    • https://ventsistem-bg.com/userfiles/file/komave.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa89ad62df---42536611099.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135164da5e88---12980721054.pdf
    • http://krakow4you.pl/krakow/files/gaguwizenazuxirakiposeb.pdf
    • https://thuhuonglacquer.com/uploads/news_file/puximosakavezas.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/zodizumotadul.pdf
    • https://98ing.com/upload/ck/files/20210905_012339.pdf
    • https://clinicamanila.com/ckfinder/userfiles/files/38569040571.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_off0000d81e.bin
e4dd0198f84ea3c419ae2d2db023cdb74b969680c50cb60176da878a0b85efa3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 18932 bytes
font_01_sfnt_off000109f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 16792 bytes
font_02_sfnt_off0001220a.bin
aed98cd403969e43181c7f16d1f01536d6918d218ec7899c141bf2a6f4a878d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 11328 bytes