Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e691cfe0c28a2e…

MALICIOUS

PDF

86.7 KB Created: 2021-09-07 12:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1b9af48b7421cd48ed11a8bf1ce77657 SHA-1: 3faa19488c2c48e5d4bf2746e51464701e23eec1 SHA-256: 94e691cfe0c28a2ed00f56fea94e3a98cea89185ab69b354d86314df660406e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=wacom+cintiq+27qhd+user+manual PDF link annotation
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160915c2161951---32341416794.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/texodo.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d20c64699---zevavulujalezoliga.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/mubevitinuwup.pdfIn PDF document text
    • http://sireny.net/share/files/37163753675.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/sakekojaruvotuvigu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/b4a66488c8a10eed835ba40aa0781c3e/legukinolejidevivibufaser.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2840bb66ca---degemixonamuwitiri.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kegenazizenazab.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160852cb7a74e0---dobafaluralerog.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/lixovu.pdfIn PDF document text
    • http://89928386.com/uploads/files/202108160757296567.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/wijebemutivakomoguwaxe.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210728_075437.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/19715318491.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b89c7542545---46411287256.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/q0kavprm4s9k0cj2ve09bl94s4/tukolanemegigabek.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/45d90213ea53b5c49560a68dc07296f6/23262961278.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c189309bb43a1efa0354cd6f0a0f05f9/fakima.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/16300552193.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/62149454243.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f7b5d3e6---wijabodetawivelusobe.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_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 11044 bytes
SHA-256: d2e428bb159b273c24790963621f7e0e1b482ddcec1b04ed4b0554229d6961c8
font_01_sfnt_off00010231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 19880 bytes
SHA-256: 072ce9b73744593e682ee93c3d991218de82e77cefbee8ac86dde4f272973033
font_02_sfnt_off00013532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1