Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4f1d24e6699630…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 06:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5e1c1b6a4ac5c713e092a487ac29258 SHA-1: 2197109ee7e2fc90b5d0a5cbfad029368ebbeefe SHA-256: 4e4f1d24e66996304a3d9bb047aa1e37aafd0c5ce8b643ee4f840146bd34f29c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec994a1942---bitipedaxupowimosuvivub.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/aq8a8bgn54i3t2dp9415rt1i4s/41071323705.pdf
    • http://kruengrangthai.com/files/files/xofewijowef.pdf
    • http://mehmetrasimmutlu.com/icerik/file/62632879353.pdf
    • https://specializedfacilitymgt.com/public_html/userfiles/file/50909414491.pdf
    • http://ipea.kr/userData/board/file/81410003073.pdf
    • https://www.delaneyllc.com/ckfinder/userfiles/files/fodep.pdf
    • http://mdfgiare.com/upload/files/pipize.pdf
    • http://urgentcarepb.net/userfiles/file/86167627669.pdf
    • http://ranjitabiswas.com/userfiles/files/sukametexivomig.pdf
    • https://specialgarden.ro/userfiles/file/bosunodoforoderedivexirok.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210912/1625252966.pdf
    • http://xenangheli.vn/public/files/51852901198.pdf
    • http://kleinschaden-expert.de/userfiles/file/10007475890.pdf
    • https://bahceneryaman.net/public/content-images/files/34273530350.pdf
    • https://www.adoz.cz/ckfinder/userfiles/files/10246817071.pdf
    • https://kaptenhoki.net/contents/files/napoloposu.pdf
    • http://kite-surf.sk/files/44942120535.pdf
    • http://jaluzipro.ru/public/userfiles/file/zafujova.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/852d4968b50ff5498ed391cd7a499f20/96985254788.pdf
    • https://ofly.om-digitalsolutions.cn/upload/files/kuxoxe.pdf
    • http://weilandvloeren.nl/fckimages/jimuzewif.pdf
    • https://krantiservice.com/ckfinder/userfiles/files/42470480968.pdf
    • http://bonezi.morefriendship.com/upload/files/42946439652.pdf
    • http://tdvvietnam.vn/webroot/img/files/62579683178.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cual+es+la+mejor+aplicacion+para+subir+volumen+en+android
    • 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_off0000dedb.bin
1327145d8b7d7f7a67b66b4402303a43b8a16ac6f2e8d191e0299236f511d856
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 11044 bytes
font_01_sfnt_off0000f848.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 16792 bytes
font_02_sfnt_off0001105a.bin
b925ec36e58b7070aa4512f08234426412a614423af24bc39232f180f5cd9400
pdf-font-stream PDF embedded font (sfnt) at offset 0x1105A 18800 bytes