Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ab8b2658e0acc4…

MALICIOUS

PDF

68.6 KB Created: 2021-06-20 20:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fb3a1a97c5e1734618cbfd45c4205f60 SHA-1: 47dca79b3e4347f22b0c0221875ce893cbe2603d SHA-256: 37ab8b2658e0acc4886541858100fb874a22da7453c26c9e5076a9997ec895f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware. The document body, though heavily obfuscated, contains text related to a game download, indicating a lure for users to download potentially malicious software. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=brothers+a+tale+of+two+sons+apk+free PDF link annotation
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7f6035344---duzetanumetisofe.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b13bb5fa3e3d21d48a88ef5cd5f2cfbc/70251790116.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/762f52bed07ebc543ce460042a9c4df0/sufezugawu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/94444105277.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/vojigos.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160840a07c9df9---zegolixapiditejujixuxosi.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/5437fb5aadcf6d9653affabc2189814f/32655417571.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/17baa570cd63073460054b0faa3e4901/kavel.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bb76b22e8af---88062047858.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092339a73d9a---nulobub.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/26a4c912d5b259035f459a190a077400/25480822041.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/papaxadexegurokokad.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/6b7ce091cc002c802459a0ed53fa2a04/89098441164.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/4pfuqhsg0dcp9bnkb3clcjrjts/84784882148.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/27775534451.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210618011736280.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/18631b157065d8037d76049747836b86/63640872415.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/3l8l4segrcbtp6g7bdv3r5u3mj/28976224473.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB46 5192 bytes
SHA-256: 3fe0d20dc5f47570e36d25a41e3dda8481458de3fc0b99cb202f2e4ba77ef0cd
font_01_sfnt_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 12616 bytes
SHA-256: d52ed1e6512083e34c0b437f2da9c8ee0eb9719d767d0912561b23989e00a588