Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb349096de6246e8…

MALICIOUS

PDF

93.5 KB Created: 2021-09-15 15:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43c92c43b8f592b4af92b1581bb9d057 SHA-1: 07b07c345067e2e3ca877744652a6d6c47b56ea2 SHA-256: bb349096de6246e8b97f361ba15934ce4c7de0388ffc1050197275cbf830ea20
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

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://cructi.ru/uplcv?utm_term=gta+5+fast+run+cheat+pc PDF link annotation
    • http://duancanhotot.com/upload/files/38702122579.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/88167908139.pdfIn PDF document text
    • http://konberdbio.com/upload/files/87344157910.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e1ad1b2de---nevog.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/mupela.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/36170344564.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/36687137532.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/83868965453.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4bfa57f39---56538616554.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc5d0641f---bemikofovadozu.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/18761241861.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc10b43778---88047183725.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/91330387850.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e41e36099---nojilajiwof.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/09e4c97e8e34f7fcc4f3212b4fbfdf5c/navozibefixipazofanitasof.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/suzopaziber.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a5f40f8c7---30759802345.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/60198317207.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/zazedaguvugugoxedobo.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/rujulojixawaxu.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/nuretiwekoxutudanojuwap.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/6742483549.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_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 19400 bytes
SHA-256: 55638a259a3b5c591e2101131a8f25bd2247e84c1e2139da0a7ebe1f6b8c39dd
font_01_sfnt_off00013827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13827 10592 bytes
SHA-256: 5f0496f244c6a8ee28489342c568c5b782e1777a0ab679331068579db6a7b983
font_02_sfnt_off00015065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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