Malicious PDF — malware analysis report

Static analysis result for SHA-256 497b3d34d4e7462a…

MALICIOUS

PDF

88.7 KB Created: 2021-08-30 22:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b78ae05665d8b126bb22e431518d1e90 SHA-1: 37354039434a89290995f071c094752a12d87f91 SHA-256: 497b3d34d4e7462a5a8a0e6665f4888f6bf39092bd2c1ceda86a4b13a36b5b29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/82ud3eas2hlsdlkuk2jsbdb9en/69135759532.pdf In PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/vu7s4kpks8cdpoc41k4vimg7he/3615790744.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/56476570269.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/cbb3e16b84dd599e78bf3bff0e5293b5/84382131769.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/nupivawefin.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0cebd7380---73067340317.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c263c218f02---46129356537.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/l3dbfn0v0akcvae0i12rm1pue2/64289637614.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/tuvasufekad.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086e5391e238---fujogo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5b839716b---tutojidederusolasizez.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607772105f54d---99135183137.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/7464528180.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/77643238112.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/58731700559.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/biworugulufedifimep.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/61501222762.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/fetedazutewatobi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5espbkr63q3c04ludr5j6fc6h1/76849967554.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/e3119gu2aosm2d993q2uf2v36r/jizosopenopi.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/jozekuvafewulegewavoxij.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/80180183283.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/pudoxigikabuz.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79c2418b6---63847350853.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb05f04e1c---batilufawasisapusajirutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+gba+games+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 20400 bytes
SHA-256: cd5ef4d140ccb796d1eaa482337d7f9693275c05d10874d1a0676f5e3dbb120a
font_01_sfnt_off0001242e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C45 10788 bytes
SHA-256: 18b29416555bad9e5e95e5256d908d1c220a7f0b2751632c33f98eb10bde94ee

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