Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57642b8a1897cb2…

MALICIOUS

PDF

158.2 KB Created: 2021-07-12 16:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf7d976a48e08a0c06fe171ee513bf7b SHA-1: ced3efa55f5555f0638303cab2d50c0b0f5a6942 SHA-256: c57642b8a1897cb2898119a711dc887e25792f0f8f4743b56f7bcb9ef21152ac
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The file's structure and URL patterns suggest it's designed to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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 http://asea-admin.com/_userfiles/file/20210608131758.pdf
    • http://boatmonies.com/uploads/files/zoxifexulupekalotixefiguf.pdf
    • http://kag.fr/userfiles/file/87207482888.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd49459c724---84220338985.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607852083b970---76178237409.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727152355ab---39458825340.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083428e6cb6f---30524694863.pdf
    • https://daismene.it/file/40852456297.pdf
    • http://dekoblickfang.de/userfiles/file/kepufalagu.pdf
    • http://lexen.ca/userfiles/files/jevubomovize.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/j0g0d05gjpccrjnvmtr0jqrq16/74760324442.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/24437f3bf70cba153dc59097cb9e201c/kerarivobaxepep.pdf
    • https://beautyyaurient.com/editor_upload/file/11541417836.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/n7r7oilkk6ibvs3r1vooj4gjd2/97886604636.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/910cd91c551d45b5fa337adc3f68faa8/dapogawowil.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/80251721123.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e7796491c00b881823cc713582d3c18d/folokutuxewipenudowoz.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78ad4709dc---11625759446.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/juxumew.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/9jshbt99o1g42kamalq0ja98ih/tujilevolasefetonepa.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/voxasuwedezajogav.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1c54d09d46ca3294b24e89885b3cf6b0/bikubezutovedogafugutal.pdf
    • https://cooperspick.com/files/28935649591.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+is+the+plural+of+beer
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00020c13.bin
d89e84ec085c0891ae6858e0edcafffa49d3c4a0cd380df99fe89bc0239e7a03
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x20C13 18716 bytes
font_00_sfnt_off0001dbe6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBE6 16792 bytes
font_01_sfnt_off0001f3fd.bin
aa4dce29885e61f989093ab25db97e058e4f00c2b482c93a4507585b33f76545
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3FD 10584 bytes
font_03_sfnt_off00022b12.bin
b5e6828711df65e93d7da928d9b0dc6cfd5f291f1b8eca65eece50c4e0dde600
pdf-font-stream PDF embedded font (sfnt) at offset 0x22B12 24716 bytes