Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce71ac7dbf6f5da…

MALICIOUS

PDF

83.8 KB Created: 2021-06-26 01:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03a7ca23e5bad0ef83e1ec1bac80974a SHA-1: b658986f0e90576934a870f59bdd7b2845ce89c5 SHA-256: cce71ac7dbf6f5da624b8e7d2f8f200827acbf212ac4e5255335d8bb7729b949
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a tactic to distribute malicious content or redirect users to phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the structure and embedded URLs suggest a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bd73c98a0693d2eba0a50fac8bdee3cb/fugateronojumodebipaw.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608624133ddf7---dakezolar.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/43a99a171b74a52383e0ebfd3ca35172/gabubujatuvap.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072fbce7787a---57572565598.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b91a8f48a---palazasuradovu.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160829f29ec314---mubamamowivomiduzarek.pdf
    • https://asthasupermarket.com/userfiles/file/bimifapasibovi.pdf
    • http://tinnaduraflex.com/uploads/files/zuzakuxowud.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bdb81a35f---pogesifawaw.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fb11953b4---lepored.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/94unkfsolj23jl397inrt2dg5i/21104098568.pdf
    • http://fygl.net/uploads/file/162227407708.pdf
    • http://kaupa.cz/userfiles/file/misuzejotaxolasitus.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906f052da96---89450310326.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/r4dh21uvr640k4quolphe2me11/nukivu.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c3ffea84c---giludanazazug.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/pshgpbmkhuu5519beucv09ti4p/67121645348.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/9365427921.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/5i3kqh8hadvhccjov3u3hkhmkl/rulabolororerop.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe3262cc7---dudalinamubixiwe.pdf
    • https://fanaf.comarticle_ressources/file/51535700051.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/f38cf3adace6786bffcd26671bf30999/padugepul.pdf
    • https://amadesafar.ir/basefile/amadesafarir/files/2684646443.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=name+of+the+ionic+compound
    • 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_off0000e5c3.bin
605d47f980b3567c8378a819459eb6e3ef90b1f7e1b87fa097c6fbcb60742805
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 10648 bytes
font_01_sfnt_off0000fded.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 16792 bytes
font_02_sfnt_off000115ff.bin
ff9da5153d29643061a0c344f7062499e69d89d80720d61a642ac388a35be9a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 16808 bytes