Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7213303209083f3…

MALICIOUS

PDF

83.2 KB Created: 2021-08-25 13:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c93f0ff8a63899d29b11be634f9b905f SHA-1: 4ba1b5b59d879f031d78e87152508712b2261fc0 SHA-256: b7213303209083f3ae51175721042931cf95e3cf8c3ee2ebf1532cac5fb2028e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload directories. These links are likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa306d1270---sefozoba.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/hgrn037h3l86pm8rvf00bm29km/gawidirutegivolediduw.pdfIn PDF document text
    • http://ymmicro.com/files/files/vowazolibafapajiz.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/34dc156247081dbe009953a3f58e68af/51426488959.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/dpu7qjglrgkhs4o7rsotugh7tq/bedapadexovotexutedid.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/71128296341.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/verusa.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/068969d3b6860c027095b2e69e065ed7/20903769228.pdfIn PDF document text
    • https://telorgabus.com/contents//files/71291338096.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/k7bjndelfitf7inlljo109u9h4/zejasaleguvofawe.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/cc96eb725466c3cf6ad56eb7571b8e31/31756707739.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/64981501614.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6f52ad8f---88656961444.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba979d1cc76---xinowafuwa.pdfIn PDF document text
    • https://nadamasristorante.it/file/ritawel.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/57948316585.pdfIn PDF document text
    • http://imaginove.eu/data/Files/bobitamimasoxonozop.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/77707077136.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/ie8o632djtqfb9v3br49pbin6l/tisamijejodu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160975d7f4d1b2---dedigutokeriguzujofag.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/625287d90c4e272263fb0bad0692e827/suxuwosakilu.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/bafisisomanaguxofome.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/80245335560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=agsmeis+loan+requirementsPDF link annotation
    • 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_off0000e0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 16656 bytes
SHA-256: ae3f6719fbb8661fbe217b39a9fa5c2673b74070f0483c7fe94db876713c2052
font_02_sfnt_off000124a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A7 10680 bytes
SHA-256: 94949879fb8e936049b636493781a24eb082a76e3fdabba47b2e953fd7af8b14