Malicious PDF — malware analysis report

Static analysis result for SHA-256 222144950c4c1cbe…

MALICIOUS

PDF

76.9 KB Created: 2021-09-20 22:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29dea7e3160f934b9423df9a48911157 SHA-1: 8610fdb929349fe288078736b14726b7013826ff SHA-256: 222144950c4c1cbed25e9296984ee2c72eed77eab40ded28fe5df4a8d5017dd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit users by directing them to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=debonair+magazine+download
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/43036870128.pdf
    • http://magdrywall.com/project-new/christianbook/upload_images/file/buxusabu.pdf
    • http://carrasvilla.es/uploads/files/56455126142.pdf
    • http://dxline.eu/userfiles/file/72071878397.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133d8e5db1eb---tudipilozodunulitokavu.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7acabf2cd---getededudotiwijolis.pdf
    • http://sanchariglobal.com/userfiles/file/94458065565.pdf
    • https://nsaimmigration.com/userfiles/file/rifomasagepezomujevug.pdf
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/nojesur.pdf
    • http://portableandcool.com/files/files/4792875475.pdf
    • http://olympicthesportshop.in/uploads/96922326516.pdf
    • http://topspeed4wd.com/ckfinder/userfiles/files/ridodirelikuvogelefa.pdf
    • http://forma8.kz/ckfinder/userfiles/files/mijarakikenuroz.pdf
    • http://wych123.com/upload/files/fatikonexataxo.pdf
    • http://csc-vietnam.vn/uploads/userfiles/file/23900107210.pdf
    • http://aan.kz/ckfinder/userfiles/files/tofopolalivol.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/12831656471.pdf
    • https://pmapmc.com/userfiles/image/files/sovozodo.pdf
    • http://cariboohose.com/userfiles/file/woxitevotudewawafejap.pdf
    • http://blgjad.com/upload/files/sazusofekoxozinoluve.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6cfdc33b2---semulesizipukatupetus.pdf
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/42630163277.pdf
    • http://yas-center.ru/userfiles/file/60688206235.pdf
    • http://fortwashington.abwingsmd.com/uploads/files/fuxajafesepazila.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_off0000c549.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC549 16792 bytes
font_01_sfnt_off0000dd5b.bin
3e6133f99c149610f92914ef6312cf11a19623d799200d4bf0a21e6d6133a95b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 18592 bytes
font_02_sfnt_off00010dec.bin
da599829e73184a0bca78fa0213860149f3f55dbc0e7b468e29bbbe7ae8045f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 10612 bytes