Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8736d6fb5204f8a…

MALICIOUS

PDF

87.8 KB Created: 2021-06-28 06:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4f9beaffaddcd8d2df59341a0897dd6 SHA-1: 0fe07c8047354b34a1c08c7f30514794f3154c2d SHA-256: a8736d6fb5204f8a12ffedc8e9a1d5c04336337746327e552318d6a8caf7a334
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://project-lovcen.me/userfiles/file/82197141582.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cf2b07980---tonukivo.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963569ce58d---bitobojot.pdf
    • http://przedszkolenisko.pl/userfiles/file/80991462547.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/48613746359.pdf
    • http://amirafouad.com/uploaded_files/file/bulujiganijuzuvoveredomu.pdf
    • http://humanitool.ru/userfiles/file/11829339330.pdf
    • https://linhquan-group.com/upload/ck/files/rulimovalovewub.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lodelejojiwi.pdf
    • https://daiichigroup.net/uploads/news_file/weretifelaxogajerilita.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/325a1heqm5c0n2l1cqst5isn52/vexefedavexazulegivefol.pdf
    • https://schmitz.cz/res/file/ninezerokibovulasubilabo.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/080bc4df8ce3fa22c4f5daac97ea9512/tarevenoganod.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mixiluk.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc4cd4193---doxumowerumifomupuburi.pdf
    • https://atesolve.com/ckfinder/userfiles/files/88094224950.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d05bc31a0cf2dff23107d1440aec628a/nivupebawoxepuz.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/1a2a4b03629162e5ef56eb0aca628e5a/bofesaxobefafinog.pdf
    • https://progin.swiss/ckfinder/userfiles/files/4232796066.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0fbef10d64ab1f2bb043366c264467b0/69043165935.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/988b97946d325a68fb46f9bd3e27fff3/xovafureviwebubaliduwum.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/vt86qh4gkte2jvsn2dgthgfevt/gaziwawotolavurilafe.pdf
    • http://chokmanee.com/userfiles/file/38819648462.pdf
    • http://imreelectric.sk/uploads/file/vakirogigafetekofaxowir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=oracle+linux+install+guide
    • 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_off0000f4db.bin
6d392a5c1c844efc6ab75516b041c837683abfe4e59ab90f1af3cedb011fd7cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 17084 bytes
font_01_sfnt_off000121a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 16792 bytes
font_02_sfnt_off000139be.bin
008d38ea6664d466a22f768a247c0d715453c9bf024693f2fa7ed87991e29437
pdf-font-stream PDF embedded font (sfnt) at offset 0x139BE 10652 bytes