Malicious PDF — malware analysis report

Static analysis result for SHA-256 46e61ca44777c499…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 04:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa6dc87255b09374237020b5f0cb63f7 SHA-1: 09f8bec127ee5837e0c59541b449d5efacfc6bcf SHA-256: 46e61ca44777c499a9c6e00a6892a6fb9e7b35b35e7da7c7f5466d5698350502
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to obscure the ultimate destination. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://synerhu.ru/uplcv?utm_term=how+much+how+many+worksheet+esl PDF link annotation
    • https://ctsgroups.asia/images/file/zonexoximigemunujoduviwet.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lifujabas.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/57961800084.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e4fa0c32e---96889409544.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/gawukasaxunoj.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/fuxumujomi.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/63081621460.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/5638221638.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9b4978db---15111646591.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/rutofira.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/zavuxorusedikiw.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/nazokasupagudonijij.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7a24eb2dbe62d8d1c90fefb141cd5fe6/79815791040.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1e00bccd3a3666705349fd6e15d48308/gojewedilufotimavovu.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/66538594257.pdfIn PDF document text
    • https://aromamarketing.md/img/files/wopugu.pdfIn PDF document text
    • http://annabarons.com/files/files/7583613391.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a89234e4---guzokaxerevarabavironiwo.pdfIn PDF document text
    • http://kaies.net/upfiles/2108261244351485632rmj10.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/ledegomirew.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608d344f75fa7---97239487234.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/kiwepepuluwigun.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/c553990bc30a69ef629c7a90f2c4607b/vusafopavufifipomutomugo.pdfIn PDF document text
    • https://agermag.ro/mm/file/17869686450.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/v3kcbsdv2g2b7lrbkrgm1sm96q/47816397400.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/57183962579.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/sevute.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_off0000d184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD184 10788 bytes
SHA-256: d99189631e0fefe7d19aa2e0ee5379fa84d4bca4336246bd82107228b1469852
font_01_sfnt_off0000ea47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA47 16664 bytes
SHA-256: 48a8747191a1363265b6e2bbe548d848df90340261494a994df88fd111e1a63a
font_02_sfnt_off0001151c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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