Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6116f01917f7bb…

MALICIOUS

PDF

81.8 KB Created: 2021-08-22 03:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31e3623eb288e98874ccbd3e227c4573 SHA-1: 5970aa74b5a70a18139b500604249d7da7e0f802 SHA-256: fb6116f01917f7bba352f24c05cd8da8eeb307ebf9ee9881b759e988e4b97fb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns suggest this PDF is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610daabe014b8---xomuvikajapudafofapa.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d67752e56c---84953742101.pdf
    • https://uslugiinzynierskie.com/eurostyl/photos/file/36899093039.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7470aa54b7---vasagosaluw.pdf
    • https://emilline.dk/ckfinder/userfiles/files/nuziniji.pdf
    • https://zlato-eu.cz/upload/files/91674145278.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce7889590---65198059049.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaae254d96---11585701396.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce47aac6a3---22720968887.pdf
    • https://stdtekstil.com/upload/ckfinder/files/30484802080.pdf
    • http://boschvietnam.com/files/usersfiles/files/1545385990.pdf
    • http://generale-bureautique.fr/gdb/files/file/xunopofazerujebiw.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210629_D0B1E2E36F39D8AC.pdf
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/vaxinefivuwat.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12d41ea400---64884543654.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6269509b2---29869966248.pdf
    • http://hbleg.com/admin/userfiles/files/gorexajisumajorirobo.pdf
    • http://rivebistro.net/ckfinder/userfiles/files/vununevesejijubuwof.pdf
    • http://haniltm.kr/upfiles/editor/files/nejuvisujajunonogupukojaw.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b21e4459c8501e22ff86f3ca8d74b0a5/bajakatimebajutidon.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/negeteperixazerirezevi.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d6e89492cb61cbefeeffb9cf17d86094/momegovokaratave.pdf
    • http://55thocscompany.com/clients/62662/File/bevozidojexuvasitogonajuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=is+mario+kart+tour+multiplayer+cross+platform
    • https://www.thc.gda.pl/ckfinder/userfiles/files/65955507063.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_off0000db55.bin
a0d2f9adcfab408efcd998fe7aaab3cd9d5b5a631ab1ae8e750289dab4f6a685
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 17292 bytes
font_01_sfnt_off0001082e.bin
0ffadf46ac0e6dea68f266718749248dfe73e20fe2cf3eb466c4f7bdefbe50ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 10796 bytes
font_02_sfnt_off00012126.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 16792 bytes