Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28621a68c32703d…

MALICIOUS

PDF

86.1 KB Created: 2021-09-03 11:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf5e8f215d3ca1a7ed106957730345cb SHA-1: b86a62a57888eceefa8a11817fef29c78af35747 SHA-256: c28621a68c32703d089390de8da2e95ea01ce61e93d91763dd08897d9dc1b5c4
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and multiple links to external files, indicating an attempt to download and execute a second-stage payload. The heuristic 'SE_REMOTE_SUPPORT_LURE' suggests the document's content is designed to trick the user into installing or interacting with a remote support tool, which is a common pretext for delivering malware. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/bifopifajosotoxojojuzidik.pdf In PDF document text
    • http://bienbao.org/uploads/files/17055807408.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a28662c750---29591371954.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ce4c571fe---ligov.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/53185694918.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/mipilimuxijakivezubapem.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/vibizinufogusolul.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0eca487dc3---noxokogek.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/lepaxuvukegebofaten.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/21366898548.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/39389824078.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/96366174893.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/77379865948.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/6555995534.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210525/file/16219262803827.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/6836013409.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/55118005880.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/vm2fu0816d1e9ttn6cnoo6e6j0/33214877376.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/10202760797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=impresora+virtual+pdf+androidPDF 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_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 19096 bytes
SHA-256: 5877acce3bcbd639e18446c947229f7cb10eceb3c032dc252bbc8a10fbd08766
font_01_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 10776 bytes
SHA-256: 2122f78f7f1ecd5033e819fc6afa708598d972592287328c02013f5c535dfcfc
font_02_sfnt_off00013302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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