Malicious PDF — malware analysis report

Static analysis result for SHA-256 724e2cfa8316c4d3…

MALICIOUS

PDF

86.6 KB Created: 2021-09-14 06:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea18c48b2b2f4eb3bf22eabbe751f39d SHA-1: 715a5c09e5bd7272cec69a5636492ebe950b9a26 SHA-256: 724e2cfa8316c4d3c4346038207d72ae00971ec1b557ad810a75d82ef5513afb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm intended to redirect users. The presence of embedded JavaScript further supports the malicious intent, likely to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://broadviewlibrary.org/uploaded_bvlib/file/julatizipolemorariware.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f1118a2d0---nozelizaj.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/bodogewuli.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210903192714.pdfIn PDF document text
    • http://dalaichau.com/files/60092257957.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/kanakunuteponasiwejex.pdfIn PDF document text
    • http://synowka.pl/galeria/file/surukopevimetotapazix.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/36283364777.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/17360561650.pdfIn PDF document text
    • http://dentherapia.hu/files/file/75028174133.pdfIn PDF document text
    • http://retailcop.ca/files/19413114378.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/83755385292.pdfIn PDF document text
    • http://newcityhk.com/userfiles/daxugipilu.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/81575360431.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/rowulenabugelirala.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/72858311697.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131fb0a8be29---7195931316.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139721cbe359---pimonironozadikezapefof.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/84021450968.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/patajovima.pdfIn PDF document text
    • http://marketingnews.fr/images/file/xukabozu.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/12672459873.pdfIn PDF document text
    • http://word.mn/uploads/assets/28497787636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+i+get+free+v+bucks+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 11056 bytes
SHA-256: 06fa08dc81541e4d93ccc691a5cf7562c4e8369b9a73923622dd60e2a6d88725
font_01_sfnt_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 18136 bytes
SHA-256: 8820d667dfb0c9eaef7815434479e3535efd5a8940106839872eaa422beccdc8
font_02_sfnt_off000134cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1