Malicious PDF — malware analysis report

Static analysis result for SHA-256 926be7ff7ee6687f…

MALICIOUS

PDF

92.6 KB Created: 2021-07-16 19:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97077d72abed69acdf43ff821988b3ee SHA-1: 90384a647b4b5341318ee898137be2439d359b0c SHA-256: 926be7ff7ee6687f164995cb74e35d35406a5b1918601ba613cb4049b5b97021
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which appear to be compromised CMS installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The primary attack pattern involves luring users to external sites via a seemingly innocuous document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tecnibat.net/uploads/archivos/rogigawugibejuxow.pdf
    • http://24cvety.ru/upload/files/56399808928.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/c8d571e0e7345caa87dc5e6f8c77cda6/namexom.pdf
    • http://barcelonahotel.vn/UpLoadFile/file/sesezagal.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/de3jq6opbbvt5uhc61h5okjrg6/narofulezatotopiw.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cb8c1b88c---37200638712.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a72d19db8ba---kelixofawozamijine.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/46fab4b561164cd17df9f14303fe5585/mulimevudomozonojigegerav.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096af6b23d81---69942273595.pdf
    • http://bajcsidavidfoto.com/_user/file/dedusuxozobinedobakodu.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7eca4af36---nimilobenajulerisuwijaxod.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081090bb391d---63420726881.pdf
    • http://al-bandak.com/userfiles/file/tuvoxiwogifawak.pdf
    • https://olterus.net/contents//files/xukokimowax.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9e20b575d---govisekimilugoxof.pdf
    • http://tdsns.ru/userfiles/file/95205617345.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c59039c854---vavesarediz.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9088054658eb13da24646fca05001b03/fonerov.pdf
    • http://zaun-produzent.de/userfiles/file/14386292998.pdf
    • http://bsbcarpet.com/userfiles/file/xotemedo.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/aumrhonp0qalg3mk0arohvb494/nefapumiwebizosopekoke.pdf
    • http://brenna-ski.pl/userfiles/file/75958677275.pdf
    • http://vdadanang.vn/app/webroot/assets/files/26164778194.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=greatest+strength+in+an+interview
    • 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_off000107e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 16792 bytes
font_01_sfnt_off00011ff6.bin
a806bd2f42a51d969330f620a1302e1201ffc754d535ec4de8abb36fc3a135e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 17520 bytes
font_02_sfnt_off00014dbc.bin
647c54c464cef46e32a514b5e700f4c011fdcaf489f1d9667966f980bb6a92f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBC 10412 bytes