Malicious PDF — malware analysis report

Static analysis result for SHA-256 151076d358f37bf3…

MALICIOUS

PDF

103.6 KB Created: 2021-06-12 19:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 316e7b7118283c6a9bf6e26329c9a229 SHA-1: 8c2e6fd1e0a9c98efb5be7da6a50471dd6159d0c SHA-256: 151076d358f37bf341b8222312460e69b42745bf555c3600e4079fb66d99fd6c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'Haikyuu season 4 finale episode' and the authoring application 'wkhtmltopdf', indicating a potential social engineering pretext to drive traffic to malicious URLs.

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://smidgel.ru/uplcv?utm_term=haikyuu+season+4+finale+episode PDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o4ickvkv6psdf9q2ccpnt63o85/29114907657.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/2df0f5b1cf2278866492f849ba94da59/96830145796.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/98504390739.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/tehhq160vboq60g9bi93qn374r/jimiwifotemudalu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160829701f1e40---bufinizi.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/72338334837.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/13208704391.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/fb1685f37ac7a93ac95ce22bfcf6e393/61894674932.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/100a304a865b1166f5baaafd2ae7fd03/jememiditow.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/cc32fv1k7gqria95k5n6hdev9g/3041322828.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/i67vd1blettg5eu1s0oqecr9c9/59406785938.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b089d99d1---32010326103.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/23823881360.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6fc0e17dbe08cf64c122ad9dd6feffcc/82656377459.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/355940cfb5e93749aab984f5a93d4c8a/lekixerivojumulemopemit.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/sajevisewazenodadasuto.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/591433f081bc36ec865e418f4e0c4d55/61443233284.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 24044 bytes
SHA-256: a275fb9104ffaf9ba5c58afbceb012a2bc65096dee2da7c0d4cf5364332ea744
font_01_sfnt_off0001596c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1596C 5152 bytes
SHA-256: c6eac507317d22f957fbf79df2319748ad9eb29420023c11319e4d20ee213308
font_02_sfnt_off00016b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B20 11496 bytes
SHA-256: 4ebf2488015c4ed83bcbada7d57a2570d4b87efa1deefd206c02b125b1edc4a9

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