Malicious PDF — malware analysis report

Static analysis result for SHA-256 47734914346f5c0f…

MALICIOUS

PDF

81.2 KB Created: 2021-07-01 15:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2d5b7951c7431afa421ae7a5ba3feed6 SHA-1: 0e476b733760e784067ec2faf49873078af29fce SHA-256: 47734914346f5c0f918fec4c5138b96e3f558168c46059e5d7158fa16f42e2d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farms, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://synerhu.ru/uplcv?utm_term=lacan+oedipus+complex PDF link annotation
    • https://seitonsolutions.com/ci/files/99663522810.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/cc5383009e6dc444f150841d04114954/wizafitupamuso.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/fetegarosagufetafep.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/xafuner.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/fulufokidixopalutoduba.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/408876bb65aa5389d427f26f04b4c3a4/97875843599.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/n6meorfvvf61ci7ov1oemlqrek/39607050163.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/93992552730.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/fj9pbt1ashb9gc92gvc3qcnuq2/peganef.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b07194b5e---8424961279.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/692221cf90e7aa9636348e1e3200ff06/rofanekumuz.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ml53ksvln18il01aphvkichs9i/wepagipa.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/l4bo6o18pkcobc2mge3r3ies69/77219549692.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/wejofi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb3636f5d8---88740489.pdfIn PDF document text
    • http://dgjst.com/upfile/file/xuzodudajuwixukaniloful.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e9fad4e1---24080665172.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/96oc2vkpn0tj5jc9p1eq4rtij5/fojatuwor.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/sarisoteturuvapol.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/56474610867.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/23533973621.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/151367145de09ae843e7b9fa5b947204/ronanubolarotunedojoxuve.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_off0000dc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC05 16868 bytes
SHA-256: cb2f4f0e53ec0760aa82bbe468840fbf24856a0ea79c6ea62a68cc5d18830c4b
font_01_sfnt_off00010786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 10636 bytes
SHA-256: 3361ef04ba5ab72ef6506c8028a3ae57c3a2a40925aa553900d5ee13cc1cfd15
font_02_sfnt_off00011fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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