Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f21be74ea0fdde…

MALICIOUS

PDF

87.4 KB Created: 2021-06-26 09:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdd3115809215ee42b3ea331429744cd SHA-1: 8863dd669b4883f58a19de301bdfaeddc3a0e09e SHA-256: a4f21be74ea0fddea6471dc166f1726a11154a33397ac436d7619a20d5d6bcb5
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically within form upload plugin directories, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609103118b16c---10539597161.pdf
    • https://geneticapanama.com/userfiles/file/vatomunujifegisaju.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/de8c8af8dbdde9ba42f4d53c60d2061a/95140012695.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9e452b5de153eac328fa07c037bf0960/15504197401.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49f0a6093---likegujuxufap.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b74d603279---sofotapujavuzamajigajuxap.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b4f120df9---mebokakotepi.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6065d1a58e42e9bf95d9b07f8a4320ef/22089359885.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/273d741c58a5bb6be15fbc68c52c4d67/kozivume.pdf
    • http://whatdwellswithin.com/file/35439473399.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/q4e7se5dqeft070ug1cqqlr7vi/ledofegulexevanuduzebami.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dba987a78---74048760274.pdf
    • https://alamansyria.com/userfiles/file/fesezifamora.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e86d896698---foxoroma.pdf
    • http://sakuragiramenandsushi.com/uploads/files/luraner.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b65f2c967---puwapokopibavubew.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9301a4de3---rojirorufiwexifode.pdf
    • http://alnoorcity.com/userfiles/file/fifozokubusulaxebe.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rhs8k1pj4t4sf06hu01vuc5j6f/12377777276.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/65612e824ba1af7e494edc966a435c84/43214120226.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39cf0d0411---vovarifuterapesusivozab.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/n2ak72c0tcuftotbdf6fh0h3sf/kuvifubuleg.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d47245e9e9---9121542376.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=latest+news+headlines+for+today
    • 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_off0000f326.bin
d2b0c0f778a2f08f09f0a4753ce863834ba5c73e5ce0403642b7cb39b1945c4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 17200 bytes
font_01_sfnt_off00012038.bin
f855a2b64fc0587aaa0e5b57bc3ef8c88f0c410827e9d2361ce380099e6f68e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 10608 bytes
font_02_sfnt_off00013872.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13872 16792 bytes