Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3c37486c1d859b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 01:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 864a7bd32cf9a0afb1d37657414bba2b SHA-1: c5e63497e5063e4f31391051f469a39b1da34b11 SHA-256: 7e3c37486c1d859b3d73fbb0a525a1d0d9e20e551793581d525098eb9f8eb7fa
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links, many of which point to compromised WordPress sites. These links are likely intended to redirect users to phishing or malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=xodo+pdf+reader+%26+editor+uptodown
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b024796fe26---rovesavavunilefajine.pdf
    • http://technocom.pl/editor/file/rewesubifirikogodutu.pdf
    • https://harryfok.com/ckfinder/userfiles/files/letumamaxajepozejijut.pdf
    • http://ajmason.com/admin/ckfinder/userfiles/files/16880043905.pdf
    • https://alianzatours.com/imagenes/file/xivutaduzikovo.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a451a79a22c1ecee9a2d75f2c16dc895/juduravub.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/afcr0qd3hpnurjeti9bueute10/15158712049.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073d91e01227---rudakijaxofanipasumisexuk.pdf
    • http://gandolfiarchitetti.com/userfiles/files/63504106002.pdf
    • https://booknowrentalimo.ch/userfiles/files/rufizopibadumigapu.pdf
    • https://gfwofficial.com/ck_imgs/files/sizivifumemaxigumit.pdf
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/mosonedilovojalezekiwajow.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8ba894edb---makajawu.pdf
    • http://indianspringhomes.net/userfiles/files/21934281659.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761c45f12d3---9863248026.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16108fb9660eb8---48640555712.pdf
    • https://texigo.tw/upfile/files/2021/07/17/8126042225.pdf
    • http://automsystem.com/UploadFile/file/20210621175038374.pdf
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/wofoxaba.pdf
    • http://pappteam.hu/userfiles/file/89253311577.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/763hcods0gnjn65601vikduruq/7892514828.pdf
    • http://cuacuonanbinh.com/userfiles/file/takuluvegilanezavon.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/venagifejafijopudokegopo.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a824f8c4eb2b724d078921f7e6b7c814/fejopilopipes.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_off0000d6ea.bin
a8993f57ebfa1030c619c9d3ce38a77b142946caabd9c1bffddd7a6c23b00415
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 9992 bytes
font_01_sfnt_off0000ed1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 16792 bytes
font_02_sfnt_off00010530.bin
b02e81ea38da553dd780dedae10e5fdefeb63751d466939bcd1cdc7605fcc0c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 17992 bytes