Malicious PDF — malware analysis report

Static analysis result for SHA-256 726e419751a84070…

MALICIOUS

PDF

71.3 KB Created: 2021-09-18 02:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9a04803e4791f5ea8a37d3e085cbedcd SHA-1: d695927fe42a01607f5fa9c6f7a441ec5691b203 SHA-256: 726e419751a84070fd26e5a748ee0f856e9378a3fc4f593724ff13caeef9d404
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including a link farm hosted on disposable domains and a link pointing to a compromised WordPress upload directory. These elements suggest the PDF's primary function is to redirect users to malicious websites, likely for phishing or further malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • 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://medvor.ru/uplcv?utm_term=eliel+stereochemistry+book+pdf PDF link annotation
    • http://suliaok.com/v15/Upload/file/20219121352394869.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/10017071499.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/ralakafogixoxojibufun.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/dujulenav.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/goluforovujebukawivu.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/zanikasedakovozen.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/tubemogazosuv.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/1218556908.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/88928912343.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/b2224709c1c36b2fab205cdd7135fb4b/73536996035.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/levesevevidikekizir.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/xoguluraregegekerajunabo.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ah4chpd7cu7ibajsu84fhaea34/kowumutiwokekasosap.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/pazenubadoniwujelerubugik.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/17973634421.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/bekofakipusafaxivumeju.pdfIn PDF document text
    • http://rapet.hu/files/92966722874.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/14070083565.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a2ef6b2cfc2659977acac80ae048e0ef/83989841770.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/17955953201.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/88071796326.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/93428080820.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/72583911945.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_off0000b77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77E 10948 bytes
SHA-256: 12d3a6b283487948db81939027616f82838750d6ad9341834f4d049f574ed187
font_01_sfnt_off0000d0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 15176 bytes
SHA-256: fdf266b4226b5648ad51673fdca29fdcd841ef12b303562639c0764b41bc5d83

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