Malicious PDF — malware analysis report

Static analysis result for SHA-256 533756532b790efc…

MALICIOUS

PDF

81.8 KB Created: 2021-07-23 07:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be682157d5000f6d1fc6214802cc8ba9 SHA-1: cdb31c97b8c6b9c53c60f7a4f1c9e12a84269db8 SHA-256: 533756532b790efcb38bf4d6e559faec271b7591e81b562a56ec855d824bd6ea
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9169

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/308469522ed1c0c66e31f6fbc311c879/dovokisedabizedisojajita.pdf In PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdeaf22ced---sixagebadiziragiwo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c03306b71e0---gawepup.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qh70jvoee0j9gfbjjqkd339539/lomogeniwuvedilone.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16095107f41f1e---biwivuw.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e278604c88a---sinexabajekakam.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/22085892069.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/51914668197.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/05o0jnc2vh75ifqsgo3l92rdp2/nefapizageda.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/25765139476.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b44a342849682ea327351ff0c61e24d6/20660429085.pdfIn PDF document text
    • https://latework.cz/soubory/kewukunodagunix.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/semil.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/560f43fe9a33159ed5fa03eff933e224/fibemid.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160871c96cfb56---rifavokajezelaneno.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2bf08ef92d91c6e4eea58f44a53fe418/dekerivomulinurava.pdfIn PDF document text
    • http://tulga.ru/editor/files/naboxubexomolob.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af64753ee79---tuwunogedewibas.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a931b540718003c65e079c9c1db012f4/1239208744.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608edb69afd00---puwadoviju.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/41cb34252d5454608c9638fce66bf87d/30399924681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+quest+builders+2+sunny+sandsPDF link annotation
    • 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_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 11044 bytes
SHA-256: feb2deb91d1976fe07a456cf1756ff14d05ae5bc2bd827125e8adb24205d02db
font_02_sfnt_off00011b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 16948 bytes
SHA-256: 511ff08b563ada0cc0b35edb52344ab2979d523e13af9a64449da0e8afbd0bb4

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