Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93924cc0068e850…

MALICIOUS

PDF

88.8 KB Created: 2021-09-01 05:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8cbfd9e2ccdf29f5522f40871d77e61 SHA-1: ee2843e94e54e6c1654855591ae477fb8edfe8ec SHA-256: b93924cc0068e850c193d6ecb19f66159f2caf7b1522625bd4a13a309c8a7707
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chptravel.ir/data/file/fegoximifumugo.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/443199536.pdf
    • http://ahcxdq.com/uploads/file/22075541177.pdf
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/romofaz.pdf
    • http://union-montage.pl/userfiles/file/rudid.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6a5d5a54---23593846341.pdf
    • https://cpsguffanti.com/uploads/file/87019439322.pdf
    • https://lapalettedesarts.fr/gestion/file/lofexataza.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb626664b87---12346754167.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720506ca858---67841386461.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b26560900a3a27c1f24b454d44575421/wesomom.pdf
    • http://tvcsoltau.de/userfiles/file/zujafinala.pdf
    • http://biplano.eu/userfiles/files/pezafikuv.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/03c81c3e21da9dead4789550f0dcbbb3/11422493932.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/78528887357.pdf
    • https://classconnbio.com/img-jacson/files/42346270560.pdf
    • http://stillincontact.com/images/mails/file/48247314431.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ab319643c---7426593466.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/9d84c8c22ef97a3dd18d139a894a189a/mulukonibafun.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/00b5154689d37ae645c68164c37b5419/menilivo.pdf
    • https://affordans.com/ckfinder/userfiles/files/komofavafopavux.pdf
    • https://martensmgt.com/business_school/uploads/file/lejolovalovijepulitetisij.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/hp02vknj2dgndn79f73jpq9i3g/11230146675.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=is+it+your+welcome+or+you+re+welcome
    • 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_off0000f7d5.bin
194ebf0022867916127f4e2fc4be78a6e40cac81b802a97904b581b60515cdf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 17972 bytes
font_01_sfnt_off000125dd.bin
ab294d779fc149d6a3a886e38e5e1d3fcf9585d2ca9541c24522e913e8b4b738
pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 10376 bytes
font_02_sfnt_off00013d80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D80 16792 bytes