Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e3e7a5fdb71f64…

MALICIOUS

PDF

87.7 KB Created: 2021-07-04 02:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7c6e1030432fa2c37a6bbb48a90b8ea1 SHA-1: cecf0c9c52f0e925aa26b9173efb69b239d32719 SHA-256: b2e3e7a5fdb71f649e7845dbb3ff53d0f7114af87e6d2a45fe8098b0269594ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting domains. The embedded URLs, such as 'https://ketchas.ru/uplcv?utm_term=fitter+theory+objective+type+question+and+answer', are likely part of a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ketchas.ru/uplcv?utm_term=fitter+theory+objective+type+question+and+answer PDF link annotation
    • http://www.findvoters.com/userfiles/file/52507518916.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607e274f9f084---15246879680.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/15942155938.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f093ac916---defufumejijolesew.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7311a8e129f06296732b5c40b97ab533/94974123529.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/61093344982.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/luxenadurikujine.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff9ed92ab0---27214906916.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4650961a63beae7293ed57f09871e3c5/jixirejowutapidumadakened.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608824f73a17c---74381517222.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/87159me01fmm0des7rk5gravl7/dalajuxiw.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/61317193058.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/11f16fb09d1a4a6751be62c29259b78f/54778025753.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/u9ahm3mkr68vrhv4tqen605d9i/88968452939.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa41fc9e245cc4603835633425522c04/tivixeruwazozuvez.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/zilamasawobenofozaduw.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd1a5ed70e---91350938788.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/13859647480.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec68276e1e---kademeka.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/1d9d2de17061852bd372b3d178ac4a9c/bokisazazikasuvojada.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5dd28b0c---zujutunoxazixizegezud.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/46418430879.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd144f900---bolibal.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce59d90979---fovid.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608446bb8585d---vopawazamuwijajivokubigo.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FB 17960 bytes
SHA-256: 30d4061d8b52be3e7078172d57f70d541dd95eedf81bbcf410e3557c582c417f
font_01_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A3 18096 bytes
SHA-256: f22c526d2f3da90eaec44077646aaca5627d3ad636980af4317ec563e01661fb
font_03_sfnt_off00013654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13654 11324 bytes
SHA-256: 9c5384d0aa24576f50789ea61ffab833c183e238c774a7e3d83c84d2d8db1789

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