Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0005437f91975ba…

MALICIOUS

PDF

71.8 KB Created: 2021-09-29 03:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a00c94ed027d945b55407d9c9d2d67aa SHA-1: 4b1d487ad6d52cd7e095d6f8f5588e900f0f6d16 SHA-256: c0005437f91975ba7a553189929f0eab6aa591cba0ee2eaa47cddba872301359
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://wolfpackbasketballacademy.com/content_docs/kegavexoraretilebowu.pdf In PDF document text
    • https://barcelona-health.com/files/galeria/files/bozubizunivabagum.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/pevulivewujuwetudozeviv.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/49469607103.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614669c0c77ea---80650013244.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/95155425972.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/959678870.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea045581e---10726837669.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/qd1v41tk2igun5qfv3slcu2sqp/47996889182.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/pegebanazunemubusir.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/76853228437.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161347a33a61af---zosufudam.pdfIn PDF document text
    • http://teplospectr.ru/images/files/dexemikusovekojidixifo.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/18058385985.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ee52b60eab7a6f3d338c613c3d1c01a1/75747490849.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/22643720666.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/89202115044.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/93286302822.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9241410d5---wizamikabekavuzagibuvu.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/vadadenivu.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/87362834573.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161330d83382d9---gilavipuwevaferav.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/34586670596.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/32788411906.pdfIn PDF document text
    • https://best-label.com/upload/files/79445246740.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/63963922653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+kingdom+rush+modPDF 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_off0000b78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78E 16596 bytes
SHA-256: 623cb12d20bbc54175adf30fc821bc1b7c28d07774e011a87d7d656e8dee0b50
font_01_sfnt_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 10744 bytes
SHA-256: 00786669cf13b3e562bf7ca2b6f7c37cad2cc9b72d07637b8249b7c10795bb0b

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