Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bdf76308db824b…

MALICIOUS

PDF

89.9 KB Created: 2021-09-04 12:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cbd82591919d5fe2aab47505d7b1523 SHA-1: 286803118664b0a0e4f359549066cadc69490c36 SHA-256: 52bdf76308db824b9b3a9c16860b20a5ab0ae08c353e3a5e6631b395af0b3253
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL patterns strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b122570a781---xoxevatalibubinav.pdf In PDF document text
    • https://shellserva.nl/docs/Image/file/pipojufisikin.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/06a5bf6f2de34c0a2ae506ff776f9f83/kijaratiruge.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/kafiket.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/patolexurodun.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a42006d5ed3---67313639033.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6ceaddf9f---61289145438.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/62956385654.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/jabusufetopaxipuwij.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3786a3e2f---83955480329.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/tevebedubulokexixiruri.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210822_541DE0DC7FA9C1E2.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/roxilejifok.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/18275237644.pdfIn PDF document text
    • http://damutech.kz/upload/2021/08files/210823220014729436wpuhe.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/rasam.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16112283e8a64c---51580192344.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/13653652274.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8842248e7---zojituro.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/41257730219.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160825a4db2b9f---jidulefapedisus.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/vunapenuxupuwuwulufitede.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e1b6204a553e9cd312ff4ec1745393f9/22905512077.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/zepejid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=kanban+softwareentwicklung+pdfPDF 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_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 18940 bytes
SHA-256: 8f1c416f7aa2d065feee330d653ac30cbf74a6ffa87472d75e4b6f25cd139d67
font_01_sfnt_off00012850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12850 11204 bytes
SHA-256: 21213c2c5cd4a1e3552c71b736c4d42c4182a0a7a6ac899b8b10eeee5863805a
font_02_sfnt_off0001425c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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