Malicious PDF — malware analysis report

Static analysis result for SHA-256 41afc97c90b82776…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 10:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f105b52ae885996779387387fcd3ac6e SHA-1: 39344847877ddba407bae8916bc0e06f70fdc179 SHA-256: 41afc97c90b827760dbb903f61b868f76586eb81155ed291d521467486a1b759
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and malware distribution lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser extension or update, a common tactic for credential harvesting or malware delivery. While no scripts were directly extracted, the presence of numerous embedded URLs, some pointing to potentially compromised sites, suggests an attempt to redirect the user to malicious content or download further payloads. The document's structure and embedded links align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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 https://oceanflowerhotel.com/uploads/image/files/48620472753.pdf
    • http://eternaseguros.net/files/files/lofiketopesajakire.pdf
    • https://rajakeempat.com/contents/files/32103582373.pdf
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/40770029686.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338287d094f---18027285673.pdf
    • http://doktor-okonski.pl/uploadimg/file/39186255183.pdf
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/nedekajemariresate.pdf
    • http://sooam.com/files/fckeditor/file/14391341046131f95e7c369.pdf
    • https://tunhuaduytan.com/upload/userfiles/files/jaruzetexikoximijofipefe.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/a2a3fa01851f3b5acd074a7fae3a10fc/tovewoxagil.pdf
    • http://ylphs.com/ckfinder/userfiles/files/3398596537.pdf
    • http://sdv.sk/userfiles/articles/file/10743634994.pdf
    • http://mtegl.wsystem.sk/userfiles/files/26188773056.pdf
    • http://teplorium.su/userfiles/file/zizidugelekuv.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342f71ce297---togorososabo.pdf
    • https://maviet.vn/upload/files/70505684177.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/64037460614.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f16538cfc4---47742913279.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/4fca132fa00b6c638165d8131f45903c/vaxefazizutafatavofu.pdf
    • http://www.bluefashion.cz/ckfinder/userfiles/files/79684949848.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/bepetilitenuxo.pdf
    • http://boothbayharborshipyard.com/userfiles/file/negozorifajuf.pdf
    • http://oris-am.com/editor_up/34502283497.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=chrome+apk+update
    • 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_off0000e5ba.bin
e0d2e348ca134c4edb0ad4227332f8eb2a4f1d113687f5535b1c10e9b40cf78a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 17632 bytes
font_01_sfnt_off000113af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113AF 16792 bytes
font_02_sfnt_off00012bc6.bin
b929a5df3b02aa5127762a7f11096ad74954d592dcb201abe0d62415432f5320
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 10472 bytes