Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96da3a06fbe9813…

MALICIOUS

PDF

92.8 KB Created: 2021-09-13 12:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df8a6867d85d0fa4fc811b7ff99aad84 SHA-1: 891c7ec2aa82dbb813adc67be8f69839e64d002a SHA-256: b96da3a06fbe9813c55215f95d02bca96ab683ba49accdc77c911d2105e37840
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to obscure the true destination or leverage compromised infrastructure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or the delivery of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5104

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ldcpc.com/ckfinder/userfiles/files/satakifimerit.pdf In PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/rawegufinigugud.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/xexefaj.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/90627782226.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/75a520da41f0f1f6260f3a3039d5e632/zuxogerorepu.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jolakazejinegalof.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/luwotelirowadag.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/kukebawakomafigofofeka.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139787cdf81f---60550040127.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/49208866968.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/43445429794.pdfIn PDF document text
    • http://lulanjina.net/upload/files/31983868976.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/mozizipinuboziwo.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/19196577175.pdfIn PDF document text
    • http://bronia.org/userfiles/file/tinuzubuzozojuvodawa.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/voduwepikekuwevarete.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87635712577.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae695a5ab7---1857468411.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/dixizojonizusesabetibasa.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/17624784653.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133661a4fa7c---guzivono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=oxygenos+poco+x3PDF 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_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 10464 bytes
SHA-256: 39366671864227a93daa580975f3112ffb7b4236e212ab6b7695fae22a7a549e
font_01_sfnt_off00012c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C52 18932 bytes
SHA-256: c1594be4b2dc8f317dd8e7febbb61fd5c832977a6e0e901e1da187b21a170e05
font_02_sfnt_off00015d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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