Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e51a59ea533ebcb…

MALICIOUS

PDF

77.8 KB Created: 2021-09-14 11:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 061ad071624698f455e2b50662dda0d2 SHA-1: f9948aa616db830c4185899829744de219a522f1 SHA-256: 1e51a59ea533ebcb3f842ad02e067085fbbed759609f6fe4391a0e7254102bc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing attack that likely leverages embedded links to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=how+to+set+password+on+gallery+in+android PDF link annotation
    • http://www.deco-interieure.com/userfiles/file/gasakarepupodetisex.pdfIn PDF document text
    • http://panova-art.com/files/file/23912093940.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/vovajekivakapezujaxe.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/duvarusajudigizemix.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/dexewevirefeg.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/43815623331.pdfIn PDF document text
    • https://kultmotor.hu/images/files/97165687799.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0dd9fda05a3f5545c66a99d88a51efed/bijotutajasupep.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/10027297760.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/guxotebewixojorifof.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/55102100221.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/49665395855.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef6fb0f8b7---5034424420.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/xekumodixedisilabokav.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/83238150426.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/nexenikopadejaroluputabu.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/fasobiviroraze.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/28991160014.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/72704453089.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/39888669686.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/nalobupazaripelukobamowa.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404674975c6---62061607412.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/74959255211.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/kimozomuponejafivar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4C 10756 bytes
SHA-256: 4d663fa09133fc4de9d78cd2a3b31efd491d4ebcd8a602703ddbc5a3cd255f16
font_01_sfnt_off0000e3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 17428 bytes
SHA-256: 5b0924fa4face03a080121feefa751e39f6cd4d4ff5ff16d04ebad82139a2662

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