Malicious PDF — malware analysis report

Static analysis result for SHA-256 b588640978b875a1…

MALICIOUS

PDF

73.9 KB Created: 2021-06-26 20:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52024f3113324a985976da72a201c8b4 SHA-1: 9b82f8fbaf985e958a4507b8d7fcab1de7667f0a SHA-256: b588640978b875a1c7aa013ea8148ffbee8559d8f3b39950bd74b326e14a8421
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/junexomowebe.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/6489c4312c3443a55cdbc5274c7ebbd8/zozegilusi.pdf
    • http://akinmedikal.com/uploads/file/zubukavudimapebad.pdf
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/20407824754.pdf
    • https://pelletier-tp.fr/ckfinder/userfiles/files/95661004368.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/1f1c28948dc6ff4246a293503ec6e8ea/49628482676.pdf
    • http://nfrostov.ru/upload/files/72273004090.pdf
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/kamirolanenera.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210625_3ECF8823D29685B5.pdf
    • http://cwesp.biz/upload/file/34846732138.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c7301bb99---8083622220.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/87972934714.pdf
    • http://aucoindeshalles.com/menu/file/6186831995.pdf
    • https://parklanehotel.asia/userfiles/file/vafogofev.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b97f043fe---pitox.pdf
    • http://alarmy-kamery24.pl/userfiles/file/57630787297.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7aqqb8pif6ss0d1ft6hqftg49j/73739072006.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a471989a5ff---nolav.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4461345d---kewamadezaregutan.pdf
    • https://muguet.fr/sites/default/files/file/92442066256.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089acaa47620---mejominumumexorobomogiza.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/d0uls3qt1j4jn39dud1mu7e8v0/29859454063.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d35ba916654---23138228202.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/43ovbkn2a2mrll3njeup1muh51/rinaxutude.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/43162879119.pdf
    • https://altbuket.ru/files/11317333599.pdf
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/51471614876.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cities+skylines+traffic+manager+mod+download
    • 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_off0000bd42.bin
ec765811e2cbfec7544e54122d760afd5038b6752b0a75521a1ab31df6c7035f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD42 11144 bytes
font_01_sfnt_off0000d734.bin
593b0e61ac409f98e708dc24d5eafbdba8fc090523e704655df12c972f8c5b93
pdf-font-stream PDF embedded font (sfnt) at offset 0xD734 16236 bytes
font_02_sfnt_off00010197.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 16792 bytes