Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e9ea1b934c8e9f…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 07:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f1aa3a229859edcb4c1aeacae4a815b SHA-1: 2938d629a4f1e4fce5e04fe9664d1fd6fc015f34 SHA-256: f6e9ea1b934c8e9f749cb3c3eb9060c64010ea91730e33de88cbd7355c1b22c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/66721e807f756a17b0658228c88a8a2d/11110814698.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf36bef86---60897741620.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6c050bc10c15a1f21c38a634ca8b7ca5/54024318907.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/nmjvjtn5o442vf99vq7o5ljguj/15334427612.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0832ba35a9---vexugubisutuluk.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd3fa951f6---23582838275.pdf
    • http://alibabashipping.com/userfiles/file/74957663902.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e01181517---mejijodifijivep.pdf
    • https://alrukn.co/userfiles/files/nibofujexatigikowoze.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/8mr0pjhau60ia6k3utu1vaptp2/57380107571.pdf
    • https://memoservicesrl.it/file/86295411789.pdf
    • http://cathugo.de/res/wysiwyg/file/mojobikoked.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/gofonenofatix.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09843ec8c2---xademijetukosaj.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/da0d00083f4a1f052ba3cbe4e5a38ba0/ximutavivabufu.pdf
    • http://beamstraffic.ae/amb/userfiles/file/najixenumekidagarababo.pdf
    • http://srividyaastrology.com/userfiles/file/remaboturapudipuziniloju.pdf
    • http://beadsandsupplies.com/images/file/kibetekopadefofi.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949dddddaa4---3894403274.pdf
    • https://lacaune.hu/userfiles/file/dojonutas.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/daliwuzadebepejazorux.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/p1rsngnbptv86rr9u71haq5884/60508705770.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=coleslaw+carb+count
    • 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_off0000eef6.bin
37a9c5f79f4a3e578cbecfeae9f52ea62f2f511fb26499ab6678501192bcf257
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 10488 bytes
font_01_sfnt_off0001071a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1071A 16792 bytes
font_02_sfnt_off00011f2c.bin
df54113247fe05e059046fa4ed7cbc8b1872d1febf2fa0412a209409a4a499d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2C 18560 bytes