Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c69839ff2c78c5…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 08:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77af7bfd3ecf2c927a2154798cb8b0dc SHA-1: 312ebd01c1fc003a03bae0786800bb4e6eb3cf2f SHA-256: a2c69839ff2c78c59c7fbc0143b1b62e3ca262eeff37d4dc65f18c436ddc2158
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=php+for+beginners+pdf+free+download PDF link annotation
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/g5gmgm8p2vr9dolahfm2qbsarg/9154159053.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/gizovusuvosalikejid.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f606bb0061---77129597360.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4be71d9231---nawijitupagakoxa.pdfIn PDF document text
    • http://inistor.com/ufiles/files/10641367611.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/jipobevowubefope.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/kevidanafevize.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/bafudosogaval.pdfIn PDF document text
    • https://edusfera.pl/upload/file/kigamejev.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/48qkelm55mmj74e32dhkjaej83/20341555748.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/lixofibufupimowenamipume.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/9ad7vnbsij2fk4gk04aq5aats0/32709242561.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a55a3dd325c---43849740312.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66517d4310---48139763957.pdfIn PDF document text
    • http://axwelindia.com/uploads/noxojixegeguxaxedavoz.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/ruxemilupuni.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079300db60b5---26750389950.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/1292820403.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/fatekejekukasubowidoda.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ced391e03a---33807890859.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zasokufikanojegamu.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/tajexuzikitiwitusopojuku.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/rolalejidusute.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 10908 bytes
SHA-256: 78f5d6d756cd6d82fb2944c6941bcef25e7789647521407571334e0e2744a9db
font_02_sfnt_off0001134c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 18072 bytes
SHA-256: e347cab360968ce58e8effdd10c1edd56bbf658453e3fd44c066a34c7590ad28

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