Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a230b202394b9cd…

MALICIOUS

PDF

72.6 KB Created: 2021-09-20 22:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73772557afb17dd49d17a8500c16012e SHA-1: 1de95a190f09b398a12016e212eeabfde86d5b71 SHA-256: 2a230b202394b9cd27a354f40df195130f8b73636d2f6a4883441604324a84e5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://wpchkg.com/upload/image/file/69354009567.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6221bb6a---likiniz.pdfIn PDF document text
    • http://bronia.org/userfiles/file/zusererawufi.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6147573fe5835.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/xiroju.pdfIn PDF document text
    • http://asustainable.com/global/file/winunemawitexoge.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/brdi4bf21nscfvlijsv2uiv5tc/37190200966.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/befewebumorivut.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/19271127399.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/50014189599.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/gikotufare.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/togudas.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/kiredipifudizunasora.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614799af9bcb4---xuligelalemafomisino.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0vjkeh3blmvabra4lufkt4pdd6/jaxajut.pdfIn PDF document text
    • http://htygroup.com/upload/files/62489736715.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/560401414.pdfIn PDF document text
    • https://premiersuli.hu/files/files/gojitebaxa.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/fekudasadotumut.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/jeniso.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/64389451624.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/gipoza.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/vexekomuvipe.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210904_472D1E71AF69C0F9.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/gexuloxozemebaviwowolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=neha+kakkar+new+song+downloadPDF 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_off0000b88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88B 10492 bytes
SHA-256: 7e023c96bd8468f3118b2af7ef413f64a742165adddfa83fe7efc82631036b0c
font_01_sfnt_off0000d031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD031 17188 bytes
SHA-256: 2732060e324163c50c2750209de2b9ce8796854bdac69162e84fe5310f10b83d
font_02_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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