Malicious PDF — malware analysis report

Static analysis result for SHA-256 850e72ae5e6394d8…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 05:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e5c3fe0aad7bff93234b0e4813a7c9cb SHA-1: 5e49d701227dabd7fccc10c300a71b2139e579fa SHA-256: 850e72ae5e6394d84f760d1a8d924561768f3797e0f635a81665db8c811c8168
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains. Several of these URLs are hosted on compromised WordPress installations, suggesting a tactic to distribute malicious content or phish users. The presence of external URI heuristics further supports the nature of this document as a gateway to other malicious resources.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3973

Heuristics 5

  • 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
  • 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://pistant.ru/uplcv?utm_term=red+sparrow+jason+matthews+pdf+espa%C3%B1ol PDF link annotation
    • http://sarkar.ie/userfiles/file/47443057828.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/rigazateredakosoposafiz.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a494522f09b---pefetotabimobajemefexivow.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba5bdb7afc---kokumuzewisumuparalizuz.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5d8c0caeb---jumavavefatemaraj.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062023105812.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/31826051754.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/84566630642.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/r2h1c0s31c0kd6blemhi9ppi9v/gaxilafumelesijako.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/23077386587.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/60839437529.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/67347571827.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/pizanijebitojip.pdfIn PDF document text
    • http://santeh.md/img/files/xulobumukuvo.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/28218811066.pdfIn PDF document text
    • https://mollis.rs//files/sokarerexuditesim.pdfIn PDF document text
    • http://royalgroup.at/tmp/mogofuzazabusuv.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/4084703579.pdfIn PDF document text
    • http://uamarkets.com/images/file/satazofilunuduvex.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5e0ddab1a---xakusojetubusot.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/kuwimimetemolizajuzolovol.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1332f3b2d---14969680993.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/puwozabe.pdfIn PDF document text
    • http://budka39.ru/files/11892159393.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/56936347348.pdfIn 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_off0000cdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 11136 bytes
SHA-256: 0821c8e336c09dc04c24ec299146fb28f9e3bd03956b75598ebb94c514611f18
font_02_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 18748 bytes
SHA-256: 393a73c3b3542f6001990f10463896f895ff0702a57e918b6f79034a9752f0d3

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