Malicious PDF — malware analysis report

Static analysis result for SHA-256 43226468e198345c…

MALICIOUS

PDF

148.8 KB Created: 2021-07-03 03:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 66be5f3e28c3c464e66678d74c4de570 SHA-1: 9233e3b220a549d1a241209640ac27b38b2599c3 SHA-256: 43226468e198345cda91d9d6398a645fa601d25f11b62b70a0463aaaea64d46d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination or leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c05d4b2afc9---saguvanavopifenif.pdf In PDF document text
    • https://hophamthaibinh.com/upload/files/98156280.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/jiganewowisaduwedepi.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/34350997317.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/11601851804.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/70720911435.pdfIn PDF document text
    • http://bakoca.hu/files/file/31626498016.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/megemazatalujizuse.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a487ac49137---wovomoxomowixewop.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7e2d6f2fa---nepabetobux.pdfIn PDF document text
    • http://armanetti.com/images/rijerarulileninewa.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4d84491e---sujodisivafoxofuwivof.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/69532744715.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/46103910460.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9319d6df9fe0e83ad9f840dbd0c09b36/silit.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beef66ac8bf---begobevidudu.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b054050d9f1---pafamoxavovaxego.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/77434732412.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/givj6cagf1c9iae54ut6d2n0i4/29854313048.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/423e35425c2667ca2ce73bd5ae60e94a/dotobejurovugijajuvode.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dom73fpqbekhsbkonjm8pgv29l/23703239646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=folk+music+meaningPDF 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_off0001e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E15D 20672 bytes
SHA-256: 27425f0daa3c34518f3989a4753cf02fd13651737945c20b0e1c66d0a4fa6647
font_01_sfnt_off000214a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214A8 10544 bytes
SHA-256: c0883345e0c0379dcccf8d8fd4cc33cfe128bab6a74bfda2a0baa6dacc576030
font_02_sfnt_off00022ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22CA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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