Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df657ae30551b61…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 06:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4897f05f90757ba5b7989673245b03c0 SHA-1: d628cb286d8d3b1b05db0fdc76f5d430ded2dd7e SHA-256: 0df657ae30551b61906c79233a8e168ddd3e8cf4316f8c80eb057647584eef7b
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF itself does not contain readable content, but the heuristics and URLs strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/dccdaa8f6e26a98aac7920dc691399f6/75597083215.pdf
    • http://zeminyerkaplama.com/upload/ckfinder/files/vewasibemebe.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5ff8494f9---ruxik.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082acb951411---nunokedutoredufizopajek.pdf
    • http://grandchainfamilyfoundation.org/clients/85333/File/54695952873.pdf
    • http://dkkarsin.pl/img/upload/files/72125608618.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608795617ad59---sodivux.pdf
    • http://dtcguild.org/clients/80367/File/jowuv.pdf
    • http://quaretti.it/userfiles/files/gijawulusudumoxanexukim.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083f090e3ab4---56167593091.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07936412e4---domajisuxawinexog.pdf
    • http://katela.net/userData/board/file/7916161696.pdf
    • http://holdemigny.fr/ckfinder/userfiles/files/4310238713.pdf
    • http://timesofbangla.com/uploads/files/94543504539.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608297bbdffa4---96490191364.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aecf2a72f2---47699349258.pdf
    • http://teusz.pl/UserFiles/file/vitidobelikab.pdf
    • https://hunde-katzen.at/soubory/45950941837.pdf
    • https://onlinendttraining.net/files/860322120.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/2bdf070c9bd37f436eac46538276729d/95772642179.pdf
    • http://pizzeriadevita.it/userfiles/files/65961725358.pdf
    • http://abbuffalowings.com/uploads/files/39476544056.pdf
    • http://modaxch.com/userfiles/files/80641309270.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e0c56c5ace1c6a0420f75741740a18af/jileralunasuveraxe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sports+and+games+vocabulary+exercises+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_off0000e6f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 16792 bytes
font_01_sfnt_off0000ff08.bin
8d8483bff039b40b9cd47bd6389eef82261c4e8c32af1a2b17e54a713ce08eda
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 11560 bytes
font_02_sfnt_off00011a04.bin
51eaf21c5363cbe7085e943cbe8f3098829604b82a37a10dd8a793396957f2aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A04 17600 bytes