Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bab900e5dc53775…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 14:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5800eff6ada1238f42ba600c5eed378a SHA-1: bfe414c6fb06b5399762ee7ce54c8a92fb3e9b5c SHA-256: 3bab900e5dc53775dc2d058892f56230f3919e9af99e601420b13f415937ec69
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns indicate a phishing or content distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://baatco.com/ckfinder/userfiles/files/mofegipujeripowibapun.pdf In PDF document text
    • https://etimes.mn/uploads/files/24004150122.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160788c779df94---vanuvipalapegi.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/225de0b3ff2bbfe6fe2ef3b889f5bfc0/sebebaxururetefaz.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/11d89d9c8235113fbd95ed09898903ec/pukajin.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/ab1c3230d3099ceec4144cdf61c9adf7/35765402039.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf2c60979---jivezebipivenipi.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/70546308994.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/ngbcrtgkkgdiu7mclipbumknbm/57828030235.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7e8e1b5b---rakeg.pdfIn PDF document text
    • https://icbacademy.com/upload/files/woliwupujebonanefilo.pdfIn PDF document text
    • http://hasyo.net/files/file/73467265752.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/lavis.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5355c2d7d---17935163758.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0c6a5bb2d457ab5a0f36e0270cdd8f72/dizujiradesutetito.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e95fe2e0bd---77833238294.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/718c1a6d0880710cba836b49ca1abaaa/zawapunufevefatizar.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/loa9vrfrcafhohd6r6hdvmfc36/jebiwubewoluzubi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2223b89c7---goniwonekosibufuro.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d178a89e9d---33382034230.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/abd33020d2d699f81f73ce13d97a3cd3/fufezoja.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/33318128949.pdfIn PDF document text
    • http://darec.sk/files/files/81020995573.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/aftjlo5743mvi54sqmfgne32c6/77764647849.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/qlm4u2dm48sfs2s80ktvrnmnbi/riduganujepadeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=school+counselor+cover+letterPDF 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_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 16880 bytes
SHA-256: 11f5aa85a612a63ea403104a787c3da20df0d28ba8f9dc20fa83d286c783e8f1
font_01_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13342 10316 bytes
SHA-256: 1f87f43196fa22b65a52d579c9a8ad9ee581c154b1fd51e6b38deb1b9feeb7f8