Malicious PDF — malware analysis report

Static analysis result for SHA-256 766275ec9c4ff58c…

MALICIOUS

PDF

72.6 KB Created: 2021-09-10 00:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1790187e51b8ae4920186641f7c161a8 SHA-1: 60b2fc80f00005fe1d161feaf645ac4dfd0be870 SHA-256: 766275ec9c4ff58c775b5149a6f5aaefb0519f91672ac59e155d393143df7adb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=how+to+connect+bluetooth+keyboard+to+firestick PDF link annotation
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394e2c245fd---gegebegel.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/9454196931.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/sufen.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/7685204433.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/tuvefupis.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/20253400421.pdfIn PDF document text
    • http://asqcert.net/files/files/47638552491.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161378f4b70706---rutomofifonixi.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613170934fd0d---lonumipelefarejerulinina.pdfIn PDF document text
    • http://kite-surf.sk/files/40870081367.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/69946807871.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090814052271.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/numalizobenuviwitopi.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/fisizo.pdfIn PDF document text
    • http://jonme.net/ckupload/files/1073931426.pdfIn PDF document text
    • https://digireg.ch/upload/tuviro.pdfIn PDF document text
    • https://spyboarcams.com/files/81705957771.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/fikexafebewekefutuwetoj.pdfIn PDF document text
    • https://atavio.ru/files/file/sokinuliguzovux.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd772ba8b---betewobasura.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/42227468096.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/xogatokidepotubirib.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/spik54navccfa91am68pmitltc/fopawe.pdfIn PDF document text
    • 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_off0000b942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD154 16096 bytes
SHA-256: d0bf90f08512a5b06bb3e0d2862868ba682b659dbcf2b4d87756f5470841d64b
font_02_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 11096 bytes
SHA-256: b82e1b95501079d1d1708621ca5f93a91dc7a214507405714354dcdf6f303ec7