Malicious PDF — malware analysis report

Static analysis result for SHA-256 980ef79bfadddcc1…

MALICIOUS

PDF

77.5 KB Created: 2021-09-12 18:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 64aaa62ada47697e4ba0e636c37526aa SHA-1: cf8e0bda0e99256c27f97b99146f4e270a04d54b SHA-256: 980ef79bfadddcc10be5b2b355e45c2a9bcc13e0b2b085ad8dce6b20fa97b9b6
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The heuristics indicate it functions as a lure, instructing users to install remote support tools or browser extensions. The document body is heavily obfuscated, but the presence of numerous links to potentially compromised or disposable hosting sites suggests a phishing or malware distribution campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gediklimakinahidrolik.com/resimler/files/zikewofozejuvexafofum.pdf In PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/67085006889.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/fileserozedukej.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/67427139700.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/fasaridafazogowinuti.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131db052b307---65799334905.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161301a4b15ea0---nuzifofefajunixo.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/65378948666.pdfIn PDF document text
    • https://computerzone.pk/file/99638933262.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/xotewigisetuponuzekoti.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/47066454102.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/37438725984.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/xuvagedadesapiw.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/53f5674ceb0e97b9f0e9ca6a43648c5f/60250227549.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/40891745260.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/kolixo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/99mi5tifuauc21a5o2d8cp9i24/zedapenewalefumekizasor.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/redanuwinagilolituvasop.pdfIn PDF document text
    • https://alariel.be/userfiles/file/vabexaponepan.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/75265747493.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/xipegesip.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd717af73---7941953447.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/bapapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=remote+access+android+phonePDF 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_off0000c953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC953 10780 bytes
SHA-256: fbc03a4149e7642035b9f209511388cbea9a1190d11bc547351efc0b55f248db
font_01_sfnt_off0000e1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 18296 bytes
SHA-256: adf36157131e8f96d6fc3817c3fd0e0cd443f4bb384aa2c38fe9dbb25e5aee98
font_02_sfnt_off000110b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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