Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa6790ad5404ac1…

MALICIOUS

PDF

91.3 KB Created: 2021-07-08 10:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b6872248d9d3d5b01a42b5e59d02c7c SHA-1: c02134efe1805253e92b67d693853bc39057ff75 SHA-256: 9fa6790ad5404ac1b65171256fdfbe682f19f291d8c878a0123f9d4d11e2bb5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this attack pattern. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://majorpropertygroup.com/userfiles/files/9876221025.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b750f4e30fb---42705197491.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8502600f---5889052496.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/64955285521.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/6b8aecb3f1b6fc0ba1797a8764dd832c/wopodevopixozelujerepow.pdf
    • http://robalton.es/Albums/images/file///69705535966.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160885ed45a55c---jesefukidegaguvoke.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc88934b4---9166577174.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751cff754b0---7930889160.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/68369562895.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/25928064980.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d77d389ff18---46220947332.pdf
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27177993161.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/51164ab57331dcef1f4a4451cc82e0a2/76519447436.pdf
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/jasovamal.pdf
    • https://aimhc.com/userfiles/file/jitonotalumuzalunixa.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4142dfa01---9113750546.pdf
    • http://internationalnetworksolutions.net/files/
    • http://app8itebarandgrill.com/admin/images/file/jodizofowazepotexu.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160928305d2499---36611857694.pdf
    • https://mama-light.net/business_school/uploads/file/45775665327.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7e79eb535---21289161736.pdf
    • http://www.la-rocca.pl/app/webroot/files/files/gimifi.pdf
    • https://sasalidayanisma.org/uploads/file/86068818855.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/79380833585.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=wes+moore+quotes
    • 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_off000102fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 16792 bytes
font_01_sfnt_off00011b12.bin
44f95f14f26d9c8837528d9a9ac0e47b6dc4e5bdd596f52acb221f7d777d5c27
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B12 10104 bytes
font_02_sfnt_off000131aa.bin
0e20212c6fcc75cb6e4c5f35f2dbc51ae6ec0e347dad6586fb3cafca97933aee
pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 17736 bytes