Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ac7ca9bfb898cd…

MALICIOUS

PDF

93.0 KB Created: 2021-06-26 07:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f861a58585ae9ea083d5e97ed3abb1a8 SHA-1: 45b8f20092dffb87edacc83ae4cb65b9fdab8664 SHA-256: c2ac7ca9bfb898cde91cd9b317a72b33182b166ebb710daaf1d1887a513a99e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are designed to redirect users to malicious content, exploiting them via methods such as spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://drafthe.ru/uplcv?utm_term=bfs+using+linked+list+in+c
    • https://codecs.ro/images/file/59033888462.pdf
    • http://tinnaduraflex.com/uploads/files/5340698038.pdf
    • https://betenagro.com/sites/default/files/file/68973386630.pdf
    • https://advance-pack.com/editor_upload/file/pobipavolofoma.pdf
    • https://ikima.fr/uploads/file/boxojutexabamowoxovideba.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f0bc3f80df16eb551ffbf71cb4ba33b9/50083436304.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160877a831266a---lokejuwomeli.pdf
    • https://abe-rdc.com/userfiles/file/31167469227.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607165042b2b1---21632755607.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609243854ee0d---kikekofufabubalorakuxuze.pdf
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/kozonexew.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/51f1nkkjkg9v8gsufn0ef62vp1/48156631387.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/0jae05msg3l3qr5smf55rlc7o0/95552141432.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fgagie1jtjvulpjpocvrrcoihj/69296774345.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/44cdb02bfb135ba249fb0b4d0d7be3fc/34678596232.pdf
    • http://polymer-optix.de/userfiles/file/25080013435.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/25009d68f8dd38803019e9b4e97e5a06/furamiwivip.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7522eb210c6a64610115b763a3b90c51/94049334792.pdf
    • https://elsadaulte.com/ckfinder/userfiles/files/wudifojomawamaduwob.pdf
    • https://ce-mi.pl/uploads/userfiles/files/fuzijodizasamopotixunelu.pdf
    • http://amirafouad.com/uploaded_files/file/zenojuvizim.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9a56cd8e8c9f0c8a0507a1c318a3df43/51841500203.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d246fab1f0a---mitusu.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608df0459736d---11863079403.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010773.bin
889bfcc63ff964c9042e4b5294395c6d58682a1454294fd0f598259d69649caf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10773 17952 bytes
font_01_sfnt_off0001372c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1372C 16792 bytes
font_02_sfnt_off00014f43.bin
f4004ac31608319f482dbfb5830fd293972235167280469c9112ed4d7e91a016
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F43 10512 bytes