Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b2472f658e5834…

MALICIOUS

PDF

77.6 KB Created: 2021-07-21 19:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 1703ba975b40d1a97dc91d85347ca41f SHA-1: 248a2e9da74df9cfbe160ef0606e7e9c4b404417 SHA-256: 79b2472f658e5834aaddc569da94296594bbafb3fbfd29cb125da9351cd9e930
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for SEO manipulation or to distribute further malicious content. The document body is unreadable, but the heuristics strongly suggest a malicious intent related to external URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9326

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 http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee16260ee3---66331409008.pdf In PDF document text
    • http://thepokeluau.com/uploads/files/92731868736.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eb8117c96---99675578573.pdfIn PDF document text
    • http://goref.ru/files/file/25058171639.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/58810062848.pdfIn PDF document text
    • https://ijp2.com/contents//files/3045933378.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/sukomafedowuzumafu.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/6722569876.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3d8db3cfa---97656279652.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/xutagupegerigixatewujop.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/velurixoxobupatoz.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/94315106210.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/9c8a5352718cb363696b7547571301b2/jesolim.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/84309467730.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160936bb50916e---60453594311.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c977cdaeb3---nomig.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706635718e5---dodipivu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/eea100ee103a8c251e6dd6cf4831cdd4/37476381423.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/barisekid.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e76168f1e72b1975738bfe4eeedf7bde/nizipuvad.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/sovixukovavex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=tab+canon+rock+acousticPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 18292 bytes
SHA-256: 2c71851ce9d15a9223d0cb77798cdce9ed84d01c1576b571d5fddbcec28726cc

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