Malicious PDF — malware analysis report

Static analysis result for SHA-256 6caa50f1bfb87489…

MALICIOUS

PDF

94.8 KB Created: 2021-07-02 10:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a8f2488c8ddc30019cc1b1986cf6397 SHA-1: af7dbe48de5a5a14a288f179b8124e71778e9670 SHA-256: 6caa50f1bfb87489bb59e3815baeec16a63ba8aa916efdf1df84ac50d0edb1a8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://world-spa-resorts.com/dok/jivukigafen.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608543cf0f4e8---larowanawategiwodoruwowix.pdf
    • http://nelly-design.ru/upload/files/godakaxunigininid.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/12611610257.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607e78faa39eb---vexowutonozokuratux.pdf
    • http://www.kickcommerce.com/userfiles/file/lelupusuv.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/423500c8e4361d9eb375deb9b5b4f62a/pumolexupalozolovomasan.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080e16ac3945---fajojilubexezegot.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/mej6reimmeoi6o7n11lt81g5om/86042129244.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/3dd26e57d661703580ec30238e0d78cf/64676344422.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607375953c1e8---70769811354.pdf
    • https://hostessima.pl/userfiles/file/70306881844.pdf
    • https://atkarisuli.hu/userfiles/file/webaxegibose.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a67b3d36383---buxagezadaterosi.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f807183b6---batuwerut.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608712ef042aa---43290453349.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aac96e2b4bb---59491858440.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb433bf1f---wufefuwafurufezon.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ace0f29ba5e---36394627378.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed284b30d9---81150350083.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab885c62261---lilubo.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/690336fca17cc224ea61028181ecf45b/42978951883.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=tax+analyst+interview+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 16792 bytes
font_01_sfnt_off00012622.bin
a57fbd336911bb359b127a582f02cee309301e3a2a381e239ce97ca4fe86fb6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12622 10816 bytes
font_02_sfnt_off00013f21.bin
fbb89f52d6edc2c829b8eb6c33ade0404da17b311566d31f4313a03617cfb24b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F21 17792 bytes

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