Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bde8ce724bb0689…

MALICIOUS

PDF

86.0 KB Created: 2021-09-23 01:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfd03296edfe50f1f596de50b9604d43 SHA-1: db65d91199bad7c949136900d113cba7f5d4a65e SHA-256: 5bde8ce724bb068928303af6921e858dad4de92d3bac76fd7f56df920b135145
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple heuristics indicating it functions as a link farm, with several URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9843

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.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161314771d4673---lijibis.pdf
    • http://folientastaturen.pl/_data/file/76408624748.pdf
    • http://goldmustang.ru/files/files/navaxibamijazexe.pdf
    • http://kiko168.com/UploadFile/file/20210922201250327.pdf
    • http://filtrydokoparek.pl/img/all/25678662581.pdf
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/71142322399.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480cdaf1301---rotokuwuzovijomosetosufox.pdf
    • https://rumusjitu.com/contents/files/xolere.pdf
    • http://gazdalkodjokosan.hu/img/userfiles/file/98910011559.pdf
    • https://vsevolozhsk.mebel18.com/uploads/files/pivof.pdf
    • http://circolosilverblufitnessclub.eu/userfiles/files/2379778151.pdf
    • http://japanbizkorea.com/userData/ebizro_board/file/91166648573.pdf
    • https://stl-log.com/htdocs/cljr/data/files/42250529128.pdf
    • https://408of53crownstreet.com/assets/media/files/womobemixaki.pdf
    • http://short-story.ru/upload/file/48707957468.pdf
    • https://turdv.ru/SITE/files/editor/file/78276746090.pdf
    • https://nocenzura.space/web/img/podborky/files/niluxejemegezalud.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138f27a7d07f---53699494980.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5cc81224c---porubagafaregiguwoga.pdf
    • https://habibitours.net/ckfinder/userfiles/files/vokotoragusifevi.pdf
    • https://gujaratisamajparis.org/upload/files/28532048678.pdf
    • http://hyunsin.net/userfiles/file/firejimufak.pdf
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/33900789540.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/40418514650.pdf
    • https://kompaspt2.com/contents/files/wibenulalomowabaminuzeku.pdf
    • https://bomando.bomsolar.com/uploadfiles/files/28239690656.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=offline+game+terbaik
    • 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_off0000f42b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 16792 bytes
font_01_sfnt_off00010c3d.bin
eca4dedde50828b6cc53c641fe8946d332167e0808d6ab5b0d809f9273dc328f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 17168 bytes
font_02_sfnt_off000138dc.bin
cd0b8315f09750e53438697f0554dc69d2363a1c84b2145ac8c0128a4a5c41a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138DC 10524 bytes