Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66e3cc1af903805…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 18:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82acd80a04ac89fbc3d68eb03d77f83b SHA-1: 3f850b106fc1a6e495396d31c8503714155169e9 SHA-256: c66e3cc1af903805713c5561e03add10b4b8508b1eff5768739a8d55b4c2e609
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs that form a link farm. These links predominantly point to PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of vulnerabilities or the delivery of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a4b5ba913d1cb5a996a9518819eb4c36/kinudivunuxu.pdf In PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1jpc1f61ltlseofdin2cpm2854/xoribiv.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17b05def12---407736480.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/getisit.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210806005816.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/bekitisosunetujabo.pdfIn PDF document text
    • https://retta-bg.com/userfiles/mikilalido.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/68144fb28236d96739ff8571c8546c4f/47140357606.pdfIn PDF document text
    • http://enricobarraco.com/files/pitogozan.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/38366159.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/mijigiji.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b87e4053a5---24793935781.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/bavakeramini.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/jixojadezazojimuwuribol.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6m1qjf4c0oqh5597pm4um74g3k/jidifiru.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/judunegemurej.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/62451192221.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/89904015660.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/29483450864.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/epnpptus60pief96c7jg4ult37/2176897601.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4e46d34aa902881fa426a7637c8c5b84/8320394474.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/sagebuvamizi.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/72107642183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=understanding+the+articles+of+confederation+worksheet+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 18048 bytes
SHA-256: 0d83a3f34a17adeb5ef6129b903ce4150fcc6027275793d9a14445763b87356e
font_01_sfnt_off00010b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232F 10940 bytes
SHA-256: 3fceda4f3a0507c68b34947f3649715f6b8157238573a5330d55d4763ce9b916

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