Malicious PDF — malware analysis report

Static analysis result for SHA-256 5204f5de7210f281…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 16:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ed423982e9be7e371e5bd7fe18802ce SHA-1: 1803afeeeac102c2ae1c7ecb853c3e09a048312c SHA-256: 5204f5de7210f28138b37259b22770b57aa057c6f11f49ecc9df3c084d07dbe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to various compromised websites and disposable domains. The embedded URLs, such as http://sbnjl.com/userfiles/files/73872167357.pdf, are designed to trick users into downloading malicious files by impersonating legitimate software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://sbnjl.com/userfiles/files/73872167357.pdf
    • http://emilygrilltogo.com/uploads/files/karolokesiwuvinopejedaz.pdf
    • http://pospatrans.cz/UserFiles/File/sidaxu.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136895adde7e---fivob.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16143588d6da0b---wetelomesemulilidem.pdf
    • http://www.arborvitae.cz/ckfinder/userfiles/files/10016528951.pdf
    • https://darkoyunpin.com/calisma2/files/uploads/50346756388.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae2dd125c4---muzujitirogiluwu.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39740375278.pdf
    • http://branpc.in/ckfinder/userfiles/files/16088266494.pdf
    • https://geneticapanama.com/userfiles/file/30956520605.pdf
    • http://geasit.it/userfiles/files/33387402128.pdf
    • https://penmypoem.com/new/admin/uploadfiles/file/gupazigido.pdf
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/96909093032.pdf
    • http://londonjip.com/userData/board/file/43848828372.pdf
    • http://statsale.com/data/upload/ck/files/mogozobuduz.pdf
    • https://bocion.com/ckfinder/userfiles/files/63769906428.pdf
    • http://audyt.rowerowaszkola.pl/imgturysta/files/84325833055.pdf
    • http://kahsport.cz/userfiles/file/39944117372.pdf
    • https://mobilaide.com/upload/editor/file/zogekosag.pdf
    • http://galluccifaibano.it/userfiles/file/11143876490.pdf
    • http://elijasprojekts.lv/files/file/41013088698.pdf
    • http://zhongyuemedia.com/filespath/files/20210911151114.pdf
    • https://resulgame.com/calisma2/files/uploads/jetidaloziguga.pdf
    • https://035620126.tw/upload/greenkitchen/files/temuritodafofa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+hacker+baba+virtual+space+app+free
    • 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_off0000cfe4.bin
df6ffdecc1c1045296a54a8b54b674400bdca55a324136a99ba345f53302f743
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 17456 bytes
font_01_sfnt_off0000fd03.bin
098f2067eef46bc0223bc918cd8066edb0f65f08c56e107e099dffe7e510eb99
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 11204 bytes
font_02_sfnt_off00011706.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11706 16792 bytes