Malicious PDF — malware analysis report

Static analysis result for SHA-256 caac5ff989cd5263…

MALICIOUS

PDF

100.6 KB Created: 2021-07-04 03:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6290f902eea9316257f283f3d667c153 SHA-1: af466f1428eda9088ca164bb4087114f7c981be1 SHA-256: caac5ff989cd526398981ef8e86b10ba145253dc3229f58c7f7e3d5269478d5b
156 Risk Score

Malware Insights

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

The PDF document contains a link farm that directs users to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://vegan-eshop.cz/data/file/26095575350.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a774600fac8---vomanazuzavorami.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/pks2l1jcs72am72kptt8sfdjvo/54922097620.pdf
    • http://accronline.com/userfiles/file/63854103604.pdf
    • https://zlato-eu.cz/upload/files/69254283813.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/dfc06652b322b26705240f1c19629b61/tukenuxagipudugapebene.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5993bac7ed0bd034fabcc08e65065a85/valobinofizi.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/64457afd10e499d58a609fe47044f31a/gexozikofitebulunefi.pdf
    • http://villa-carlshorst.de/sites/default/files/file/giwofogifelaruz.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/7l38jnhfvaqdq94umt75jomupv/42944789884.pdf
    • http://szentistvanpatika.hu/upload/file/12909004791.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/u0e31d45haai1vimp0g7vdfnps/lafobuwuzevesogupeval.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/72uhr4reor7vidkpf67kc0iq26/13062331836.pdf
    • http://asja-doll.ru/userfiles/file/ruxadetonuxarugamiduseme.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608426a338d4c---wobagesolibufod.pdf
    • https://wisserarm.nl/app/webroot/files/userfiles/files/tuwovamefinikuzegizupow.pdf
    • http://stonestudio.pl/files/upload/file/63070608514.pdf
    • https://atrax.hr/files/lorogozoxisesuni.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2d1d7d1dee3756098d96a7189355becc/jazimuzixageged.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f189db9bab---xupekowozikiwinivobazek.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a2a65bb3a58944d6443f444426d5293f/lidosunonanikalaj.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a1c86c3d---powejuwomuwuziteke.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=graphical+representation+of+data+meaning
    • https://doi.org/10
    • 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_off000125c1.bin
00e1d41b25ea0c8949c97a7fd0209aeb90e470924fe86a7b6a0d1a6e45218074
pdf-font-stream PDF embedded font (sfnt) at offset 0x125C1 11104 bytes
font_01_sfnt_off00013f43.bin
0b459a4c44d687710b2cb2e5c01817ae0568db7d0e109cda8a2d81c52db926bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F43 17784 bytes
font_02_sfnt_off00016ce1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16CE1 16792 bytes