Malicious PDF — malware analysis report

Static analysis result for SHA-256 42db44d0ea4d0cba…

MALICIOUS

PDF

73.7 KB Created: 2021-08-28 00:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 193180c0e3ddc044c5b61528d6ac791b SHA-1: db59ea90622d6f6cb341523f0e4b506dca4a73f0 SHA-256: 42db44d0ea4d0cbaae1a0df774654158ecc8fca4cf1c355e955ba3b47c8a8c72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=insulting+crossword+clue PDF link annotation
    • http://krevue.cz/UserFiles/File/lunebumuroguparoz.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078584c9c44e---kibugav.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/40601042875.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/34136826261.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/94754378082.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/borukomokudijipozufiwu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/743a7c4a738fb84244c48d780087266b/zegepusina.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/volodukolizotowuro.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/nipojevu.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/wusamoxufozixu.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/11777453745.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c84ec7aa8d5---visunuj.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/72i0j4o5saap5rbpm41fvatpga/56496438465.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a477eeaf5e7---45737629523.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/18511146140.pdfIn PDF document text
    • http://pasted-radio.de/web/files/vapuruxirupab.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/38666519119.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5768c219d671ece9d789a01500a90d1b/toxinadazesodunutuwe.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a404c6b7303---nugejuwisujadin.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/popuwijodubabuvudewegana.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/j459vm6at1f78sn041livscoui/xunelaginidojigexegotaz.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/q006rcbcc76d4o0lvl74lqsrna/gamuvi.pdfIn PDF document text
    • http://dgjst.com/upfile/file/zuvowakevofovixodubumizu.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_off0000be8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8E 10520 bytes
SHA-256: 647d8a27e8903b96553f08cb3908e565bd85ce20ea97370f268e0bbbff2714fd
font_01_sfnt_off0000d67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 16680 bytes
SHA-256: cd3ecb5064697e1d3c6a97f75fa65e2d6c96b70df409bf9c665da597e4bec5a2

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