Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b93a110709e2de2…

MALICIOUS

PDF

81.7 KB Created: 2021-10-05 18:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 245afdbb8fbe475198f91ad447e22e99 SHA-1: c0c7ac854a06c68bc980882819f132a71f2f56e7 SHA-256: 4b93a110709e2de26256c1e6f2ace582b5db53c12eb52d4ac9829d7ec13d0ded
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://marwaautorepair.com/nbloom/fckuploads/file/rokofeludesaluli.pdf
    • https://alnahamgroup.com/userfiles/file/widom.pdf
    • http://ambulatorioveterinariomariani.it/userfiles/files/96770691607.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/65580034701.pdf
    • https://anjingliar.com/contents/files/52779225114.pdf
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/46839532748.pdf
    • https://leise.ru/admin/ckfinder/userfiles/files/86734380500.pdf
    • http://adabaskimerkezi.com/upload/file/muziwinijiloroma.pdf
    • https://vaitinhdien.com/app/webroot/upload/files/xajixikimuzifo.pdf
    • http://artpolinakuzina.ru/pict/file/zusubezotisekagevelo.pdf
    • https://info-jimukyoku.jp/lot/upload/files/kubisufefenupataf.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/nufivu.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143a93f814ee---57894108403.pdf
    • https://loonbedrijfschimmel.nl/userfiles/files/50316700086.pdf
    • http://anaminfo.com/attachfile/file/20428529751.pdf
    • https://mobilpetrol.olajpark.hu/files/files/vuxawijaxavazorevakimixe.pdf
    • http://ferramentabelleggia.it/public/file/lakigobisero.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2514dd304a966e9f6335ffd6499bc814/soditanafesu.pdf
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/dematimuxerupasojanud.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ad467861efa394779e6fb68ad126a60e/fipidev.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/86843510919.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/80dnn7t3ieio6ii0p39kvd5vmj/wajuzudolefegodised.pdf
    • https://asesoriagade.com/app/webroot/files/files/63511930696.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=best+trim+color+with+agreeable+gray
    • 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_off0000d801.bin
246b56719f867ef665265b7731df443422d55e042376cd342c4b06d8f3e85734
pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 17960 bytes
font_01_sfnt_off00010734.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 16792 bytes
font_02_sfnt_off00011f4b.bin
a218e9af3cd235cb23d2e541d7a6f212cd8e877f35dae68ec5161db3266e0394
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 10968 bytes