Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bdceea4e104df0…

MALICIOUS

PDF

82.3 KB Created: 2021-10-09 20:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 10cc6b34906cfe76397ecee8d37fffdf SHA-1: 9ea875d0141c13daaf7d33beaf9eb1baffc9037c SHA-256: f7bdceea4e104df0c2c7a78c7897140a4b7993c529c120231d0e49435a8b759f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, 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 via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dassti.cl/admin/uploads/file/21665154551.pdf In PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/rakozojikukusukilisuvap.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/69205437294.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/90801813563.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/79ad1237c7cef84990dc8c292fd76f18/55133097169.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/71296702145.pdfIn PDF document text
    • https://ayurmitra.com/files/file/ximuz.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5006695f1---vikejakigizedavi.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161470d68d4cf8---19596178382.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210922022549.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/wefiliwaze.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/22000733500.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/71499359952.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/didiseduwez.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/xapilesifolevinoxuraleb.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/turaviwugu.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/xetejanadigodikufagoxul.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/kipuvunudadudagufag.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/takem.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/nuwoxamap.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/fapun.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/sorogisijiresidemiratulib.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133989f891f1---fuvujizetasuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=captions+for+instagram+postsPDF 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_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 18932 bytes
SHA-256: 535f5879132f76b1f82f08fc571abb599ccf5214303761bafabe0598f8549439
font_01_sfnt_off00010b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12355 10556 bytes
SHA-256: cbdb011eb9e5ac40af46ef5cdf102c6697c7a2095e573ccf754723d93931413d

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