Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca067de386c6a20e…

MALICIOUS

PDF

89.3 KB Created: 2021-06-29 19:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8b5a5bbbb509758e876f0e029ec6120e SHA-1: efbc100db68152c44f9ca599d0f4c3885c1992b6 SHA-256: ca067de386c6a20e5fa57bcfcf90235257843cefa21e735a59a6ec08cde15f0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f771d16a5---zabigeb.pdf In PDF document text
    • http://train-in-japan.com/images/blog//file/33932465025.pdfIn PDF document text
    • https://promise-land.com/upload/file/60811532941.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/memapatusexujewoporevoxe.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/53564966325.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a89d61ee9---xidive.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd5da430d9---2196124285.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/34570882583.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/jqng2ab2csdgrfs98a5jg41ka6/8598008447.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/gogifopo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607be8e274ef3---52969613167.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/97715985650.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/76242481770.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/76594654771.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607720eb80721---36864164332.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/sgtlmpc176cdm7pjsj8v8tlni4/zememise.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/15665500683.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/43d9ef2ab3e5396c353d30aae3a73c5f/pilofejunimuteguxuregosu.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/38620040593.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a36b3c0c6---dumigomupor.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/usa4jh13s291trlt302636ai4f/289372808.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/siv7vdvh04n1ad7i9l5m8idk5n/wabovefupagurodona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=risotto+with+cauliflower+ricePDF 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_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 10560 bytes
SHA-256: 8438a040a599526d7b79050c35c4c20469632f8aed42913de633ec4088b6303d
font_02_sfnt_off00012653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12653 18176 bytes
SHA-256: a8f5a27cb983509a7b67b6d4741ff6cc33ea99835c7e0c785536c328f81f5c75

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