Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b87cf91224c991e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 15:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ebeb2b2181fb589b2fe320d92609f9c SHA-1: 999a09e51fb85cb7d6ee1df01bd935cbedeebd4c SHA-256: 1b87cf91224c991e1608b27e5d426f24b3e70c7ed99e9019e4e4fcb1a2bc68c6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution vector. The presence of external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7557

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 https://garglob.ru/uplcv?utm_term=medal+of+honor+ppsspp PDF link annotation
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/51108148683.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/witekapotonej.pdfIn PDF document text
    • http://esejsc.com/upload/files/purenaguririjajesafexo.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/talerepebumasiwisuk.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/lugepijowufaker.pdfIn PDF document text
    • http://net-work.cz/data/file/92023131729.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/67142962105.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/pinuxakobajid.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/gumakewopigod.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/tofetapabamunamowapuke.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/xavigiz.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/84564400273.pdfIn PDF document text
    • https://jurad.eu/files/file/tebivesatebigixekuj.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cb04c34ddcc1905c42471ec2bf35aac/ruwokavobukasolon.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613124ae2d617---87214800481.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/74376071985.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/sepotepabovoso.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e166179155---68357018377.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/33909026204.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4b8b844040f219e4066794f00618380f/dujamixewebolativitite.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/towuga.pdfIn PDF document text
    • 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_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 10400 bytes
SHA-256: b33e356d5d02a77155745a378e2b59552e39625894def643e86cdd9bc36c13a5
font_01_sfnt_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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