Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c432cd81fdbf920…

MALICIOUS

PDF

92.7 KB Created: 2021-07-02 03:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b52a6a7fcc9b86f41c59ca49e574a22 SHA-1: 26f812a8e17c9fd0bffc556efc10cb256c8468d6 SHA-256: 9c432cd81fdbf9200caef65fdff4986dd70a3b432ddcc31814cb20ad7fd20ab4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a method used to evade static analysis. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://sanzmendia.com/userfiles/files/pujaxe.pdf
    • https://spheresignal.com/app/webroot/userfiles/files/47811200759.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/506d29d94c85f0670c994c21b1a053d0/32825094061.pdf
    • https://vegas-shop.net/uploads/files/dakaj.pdf
    • http://vladjurnalist.ru/archive/file/40505458712.pdf
    • http://detikakdeti.ru/img/file/kakiwuvabuvidi.pdf
    • https://oddluzanie.net/userfiles/file/lisoxezofat.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbebd3036---62440902461.pdf
    • http://www.jindatunnel.com/up_files/file/28038677650.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87a416232b---62604805500.pdf
    • http://baigeleather.com/userfiles/file/40448833457.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/d617ji34u11f9m9cj0n20dikg3/konunol.pdf
    • http://msamerica.net/clients/873634/File/14541207015.pdf
    • http://norilskgu.ru/userfiles/file/33021928593.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68a9860b9---33710785716.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/615e366fdc66925da05ef040bb566774/67143941067.pdf
    • http://gustosandvic.com/ckfinder/userfiles/files/48654066345.pdf
    • http://all-pass.com/folder/editor/file/gupurazukuloruxaw.pdf
    • https://maintogelonline.info/contents//files/82679397106.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f40ef5a503be6f705a6e2dc078e7b757/lasisojim.pdf
    • http://turar-mussin.com/userfiles/File/garexaf.pdf
    • http://www.abcklima.hu//data/editorfile/zajitu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hay+day+time+hack
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8824b2690d---76043361853.pdf
    • 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_off0001077f.bin
5ffa443fdfaf206e3a90c6cd9fe65ed215b46797edd5633e7ce900a942cdf261
pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 10292 bytes
font_01_sfnt_off00011e9f.bin
15d6548c64e84b502621062fa75a43a80f62bba03835f662fe8c3ca8caecaf19
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 17844 bytes
font_02_sfnt_off00014d98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D98 16792 bytes