Malicious PDF — malware analysis report

Static analysis result for SHA-256 428b15be993fc057…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 06:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6aa34ed012ae07bed5b7faf01af9c39 SHA-1: b121be2690563032190b33743c4ed9bc70792402 SHA-256: 428b15be993fc0571bfebe44ad0a3c332dc7db62e8dec2a781cb099987e56f6a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a variety of domains, many of which appear to be part of link farms or hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://catamma.ru/uplcv?utm_term=urdu+poetry+about+rainy+day PDF link annotation
    • http://timapools.com/uploads/files/dopimaranibimajosagolubu.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/87173773631.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/retugabo.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/27905623185.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b828d284097---42696555135.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/xuliko.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/vapugapip.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d63c58cca1---budujamixiwamodesunesivej.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/83215601032.pdfIn PDF document text
    • http://laduses.nl/image/file/3039329487.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d6e42c2b2583e73816de156325e4ba44/44929954467.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d25efe110a099d1f22e78487e0a82b7b/42688003105.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/munodunivativiloba.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/dhjgrpik7hta6lgmajvkj4k1o9/ketudaxafodovuzuxuzoken.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088eb54db571---vujopuzalewufawenal.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/277f1e59ce09aedafa46655c4e2213a0/sufubajutepovemonaz.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/93938814042.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/nuwola.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac74a4e3d2---puwebobonido.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/22307730135.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/kojanidobegamubomuperig.pdfIn PDF document text
    • https://tckontrola.hr/files/zupodudenawirabokab.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/mikazujutepanaw.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/37424674500.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_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 10532 bytes
SHA-256: 5ebe8c064f171d369a9f33d64861e2b7b930e3e3b948285e876e18da9981a685
font_01_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 18396 bytes
SHA-256: 5dac578c2b5756e483cc019f1702c90be9d7b1d93d2c78999c7a81783b359984
font_02_sfnt_off00013234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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