Malicious PDF — malware analysis report

Static analysis result for SHA-256 1485b69934e678b9…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 21:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 76c2b4d7031b223cc941604068e3830d SHA-1: ab821523cb3a1186e7b0e1d044cc04156253c1d5 SHA-256: 1485b69934e678b9d6b357275e48d906ce24b71fdedfe8ad5b4a0e0c274ee181
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as disposable hosting. Heuristics indicate this is a link farm, with multiple PDFs hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://liho.cz/UserFiles/File/terujofev.pdf In PDF document text
    • http://dakmoto.cz/obrazky/file/vaxolijiduraxixisipavin.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/44437359941.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/28177460753.pdfIn PDF document text
    • http://ibshospitals.com/userfiles/file/kuvofukusemujopa.pdfIn PDF document text
    • http://kammed.com/userfiles/file/50516745151.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/pikagalen.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/96114902585.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/xovomibubumuxalimogodozal.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/59856169762.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142df4c41e19---43041486185.pdfIn PDF document text
    • https://rubfila.in/files/file/xolamopefumi.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/578ac69da985d3a3ccdf49eccfefa523/24356237928.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/bagejejevobibabilikelosa.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/zosenel.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/xasadenoveniwugogugisox.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/gatokugomamosaruraw.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/femusikefipagilexis.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b8c086bb13ba312a6cb2130765fb16a2/bexeberowulewema.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/kujefasekubepukun.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/503788450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=kgf+movie+fullPDF 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_off0000ba59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA59 16720 bytes
SHA-256: 8f525c1f692f9dcfd70edc174215fd1529e98bd1929fc046053520abc1a86236
font_01_sfnt_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 10084 bytes
SHA-256: 5fe702a3a981f959e870b1634aaf0d56ce8203bb6fe7b024f89c2e6bfe8a6a24