Malicious PDF — malware analysis report

Static analysis result for SHA-256 32efa64ab1b17918…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 17:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d82736c8f827cebce673a48d7980c833 SHA-1: 8168eb578065c33667e32c117f88de3f104fa13a SHA-256: 32efa64ab1b179184d9553e70fbc93fbc765783f3a5e81802a8c6e74e2566676
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, hosting numerous URLs that point to compromised WordPress sites and other disposable domains. The primary purpose appears to be redirecting users to potentially malicious content, likely for phishing or malware distribution, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/761crscapo997kb6ghri802h1r/36381915489.pdf In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f133c8be55---39762072106.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/70543167652.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607436e7341a3---76120788498.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/53994918602.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/gerevebe.pdfIn PDF document text
    • https://menu2uplus.com/images/file/wenuforoxewiridavekusapir.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4474ee675---jefoxitilivepebexiwe.pdfIn PDF document text
    • https://vleek.com/uploads/files/40443247390.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823b20132b4---titepukonejaveg.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/bikigelulemebe.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/xixunonazutibigixaf.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f1b8b94467d0fef637098d3d28b07a11/95777188941.pdfIn PDF document text
    • http://garderoba.sk/images/_file/wifumajomadusogimete.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-9/20210609132126914286.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/44675317198.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/jbrn1quj02hkchdqouk0100i2i/16972446231.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16126a185388a4---48806112652.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/33157238005.pdfIn PDF document text
    • https://emmaushuis.org/pages/27161813144.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968759805c2---goragoreler.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce466106cd---kobuzoturefaxox.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/gedetadusixig.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210628213540_ays2nd.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/49146011015.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/90518797588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=antiguo+egipto+resumen+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_off0000c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 10716 bytes
SHA-256: 8eaefbd7f85ad906892f300ea694700849b73e430308998fc7f88089406d3871
font_02_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 17880 bytes
SHA-256: 800da8e6b0317ac58d47def6d322bb1583dc3bedf984ee86589db87b22a577a4