Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6d2bc33bbaa11b…

MALICIOUS

PDF

76.5 KB Created: 2021-07-02 12:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 524e83f8d2536637698a5a3888bc721f SHA-1: fd4a3543b4bb4ef056748ac0cd4e0d55cfeac665 SHA-256: 6e6d2bc33bbaa11b393194d82b903c798810a140870edb93be54581ef878889d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://smidgel.ru/uplcv?utm_term=meaning+of+provable
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5819bdae9---85946449810.pdf
    • http://slpclassof67.com/clients/45391/File/bimiruzejalajidanoxod.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/v1qt54h24v2g24gfon6v35hl14/sorarufokegisepivo.pdf
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/25222614883.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/tuwedadowilujekumow.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727f9c369d9---10326564064.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1653936cc3a62d18fa354f8a95227be0/dekewenujun.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9df6c5136---67537405880.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/04b5e3c956a3234c25b0467e8804a8d5/45897022999.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ugaf6tahj7tl9s5fa9rvnhtnsj/bagovilakamudefojuful.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/6069c805a3a8d9f68ef56fd19fd91c6a/19648777805.pdf
    • https://hobbes-group.com/upload/files/binevoxasukedapujarev.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608079d8cec4f---88835366779.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/11611873596879745d36a32e1fe2ccdb/32612023231.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073a37fcceb0---guwutefuvodawegimuxibet.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/enqdii4jhuoumo85hs9g9dkau1/84687764232.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6d23dea355af70b74dd2c4b855dbed76/mubegonufo.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a92e25d902450572cc2a73400def0fe2/fetipod.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607121ff00e14---jobil.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1b6d94a56939547b5344ecf1888b66e2/39257770348.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a24ab2def---luvomon.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16073daf7ec903---88969143884.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa73321be---wokigileda.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818128a0d8c---81412122221.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160989fecae579---donobadumuwi.pdf
    • http://skipjackpoke.com/ckfinder/userfiles/files/kopagezetekinupa.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_off0000c883.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC883 16792 bytes
font_01_sfnt_off0000e09a.bin
20e5d04b0a421726c603ebe656220930067ddd536a73f905f41a2ac89bf353ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 10464 bytes
font_02_sfnt_off0000f835.bin
797e3a294ea61209001f3d81e216a4b9790213c3c6c240a320af4ed469a59f60
pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 17088 bytes