Malicious PDF — malware analysis report

Static analysis result for SHA-256 603580e1421ca5c2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 18:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a05021101d60b9fe72a453d98e0387e5 SHA-1: 9f022ee87fbeebf95189c2c04771ae849dc7012d SHA-256: 603580e1421ca5c2a3c8602c8ab04250d7583779e92eca4748c0689760def20e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a98cc441b---41516693797.pdf
    • http://balletpanov.com/uploads/files/41259371225.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/93536c71adf543baa9b71a837091d598/vaveluraxube.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d55c6846e4b44aaf4ef4ae6d9f9c5e00/rokifivufuvotajake.pdf
    • http://1day2night.com/UserFiles/file/31483523088.pdf
    • http://sbriz.ru/userfiles/file/dufasovuduzijefebaj.pdf
    • http://kxqcgs.net/filespath/files/20210908120731.pdf
    • http://mclarenquartz.in/ci/userfiles/files/43082732381.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16140848fcd94c---rizeduduviwuzefurezubuta.pdf
    • http://fizjoactiv.eu/Upload/file/tubigapekulatiligimafa.pdf
    • http://zajazd-broadway.pl/galeria/file/84407555410.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/pefuzuwal.pdf
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/1163913314.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aa75c9df3---26838454258.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613e50bd9a33d---14851967485.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135145c7b552---xoroxezarikizuk.pdf
    • https://bizimpin.com/calisma2/files/uploads/61335425023.pdf
    • http://salonorganica.ru/upload/files/43221254169.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/12630880208.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/fuxotupasexofevibofaluxox.pdf
    • https://llibreriaha.com/img/events/file/sanogemevitar.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbdfd13510---96498915004.pdf
    • https://iwanbim.com/userfiles/files/lenitemuzubitozoxuwagegot.pdf
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/6586550782.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=volume+of+cylinder+word+problems+worksheet
    • 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_off0000df3c.bin
f73bc849888d8df6c54bf37ca8c5481818c7b5a5dd3b09c0eaee28f59a5bf1bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 11224 bytes
font_01_sfnt_off0000f92e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 16792 bytes
font_02_sfnt_off00011140.bin
a494b593d222815766ffd939ab65022e74ff04dcfa56d4719eea6f4f214db9d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 18336 bytes