Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e9f16add1d4c6e…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 19:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59f4d522a29b4e01a7b6a16709d26076 SHA-1: 34c4180ea91b48833f4e01559e90987c917ef5d5 SHA-256: 99e9f16add1d4c6e3f11a92a869391218600b9a9052f4dcac35e28d296088a19
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable hosting further supports this, as it's a common tactic for distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/80174327228.pdf
    • http://maybomnuocdanang.com/uploads/image/files/13552838030.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98468cd38---webeku.pdf
    • http://assotechne.eu/userfiles/files/gokesa.pdf
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/nalitusedi.pdf
    • http://seghers.kr/data/editor/file/339038939614c861d5e635.pdf
    • https://novamakine.com/upload/ckfinder/files/sepeko.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/84272010605.pdf
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/zetigelawigur.pdf
    • https://horgaszvelem.hu/ckfinder/userfiles/files/pujagak.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142539f025c6---netililosetowixudejulorot.pdf
    • https://homecareangels.ca/files/files/files/wafusutudegalake.pdf
    • https://aczv.fr/userfiles/file/fajepapozerisu.pdf
    • http://fixafilm.se/userfiles/file/zakesokaxuzu.pdf
    • https://banghenails.com/upload/file/lobefavizabujuf.pdf
    • http://metalzilembo.it/userfiles/files/36036722182.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613727a19382a---87659532754.pdf
    • http://sakuragiramenandsushi.com/uploads/files/11085151636.pdf
    • http://kpotplace.com/uploads/files/poxuwokijef.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132a32bdbc5b---judalozoloxes.pdf
    • https://balarampurblock.in/ckfinder/userfiles/files/49780793248.pdf
    • http://dongamold.com/fckeditor/upload_files/file/bapusubigepalu.pdf
    • https://behagi.eus/files/galeria/files/78963470052.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16315310888999.pdf
    • http://casinodanmarkjackpot.dk/userfiles/file/jevulezodoxuzunosogizuju.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+sniper+3d+mod+apk+android+1
    • 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_off0000b52e.bin
ba70cad43e408f9eaadbf88c1abaccbbec7fd90cdcaa55e5ed90d8995c07805a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB52E 10860 bytes
font_01_sfnt_off0000ce55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE55 16792 bytes
font_02_sfnt_off0000e667.bin
cdbf49db380bc01c04a387462fe43de8cfc02f9f456f3ab562b81f7ab16e911f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 16284 bytes