Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c26c722c2e00322…

MALICIOUS

PDF

86.5 KB Created: 2021-08-14 09:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e200f302e733c7e64d164ec230ebf23 SHA-1: 80fd23493833388ef9b8db37a7621c27d26393b0 SHA-256: 3c26c722c2e00322fa89f37b57d50c5411fb8c857efc7006ad5741b15204719a
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights the use of compromised WordPress upload storage for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.alexgis.com/siteuploads/editorimg/file/28759100331.pdf
    • https://kuraniterbiye.com/resimler/files/zexojexedufuxi.pdf
    • https://cargobull.cz/res/file/21850176823.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/3575bad032317f4302b57ae5e5fbbe1e/1670083646.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff970dd8f---94916814562.pdf
    • http://fzsvybbs.at/userfiles/file/begenuxami.pdf
    • http://granitemountainranch.net/userimages/49812650234.pdf
    • https://citronel.com/userfiles/files/lemilapowifebaz.pdf
    • http://banghetretruc.com/media/ftp/file/48206550077.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098912e76a34---33014774090.pdf
    • http://jiin-torng.com/uploadfiles/20210803054357.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/4a6318b278f04221c88a8ab19416de24/gozojinijadibokifazifade.pdf
    • http://veterani-pushkino.ru/userfiles/files/suluzawenagikigodebubotaj.pdf
    • http://aire-limpio.com/img/editor/file/pukulugalupurokelixakax.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/8d149db947df514c84933468affaf06e/94451129351.pdf
    • https://miaousland.fr/ckfinder/userfiles/files/mipopiruwiwerugerab.pdf
    • https://calendarsunrooms.com/userfiles/files/nosexulinujiluradagomezon.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8c1187bee---99079770977.pdf
    • https://aplusadvance.com/naver_editor/data/file/91810666587.pdf
    • https://nabil-doukali.com/userfiles/file/94569515458.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c14f264f750---vejesofarebaxafi.pdf
    • http://ulsantour.com/FileData/ckfinder/files/20210805_F3CADB1F8D64F43C.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=articulos+partitivos+definidos+e+indefinidos+en+frances
    • 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_off0000eac8.bin
c025ccf658794402cf650638d2aa15b25627c9f47d76697afecb5e750c8512eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 19260 bytes
font_01_sfnt_off00011af1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 16792 bytes
font_02_sfnt_off00013308.bin
2388b3dfab656194ae1bfc8fd8dcaafb9267c184ba78f55ffc0619d7e92048be
pdf-font-stream PDF embedded font (sfnt) at offset 0x13308 10760 bytes