Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb6f401aa3cb173…

MALICIOUS

PDF

101.3 KB Created: 2021-07-13 19:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 04a8d5f4732e73330c9a14ff143e2117 SHA-1: 0f2dddc5060727274bc2f0afeaf47b0ab05fc61a SHA-256: 5fb6f401aa3cb173d6ee41e3f081a76585ade64cb6172dc086507759ec8419a3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of compromised CMS upload links suggests an attempt to host malicious content on legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://szekszardportal.hu/userfiles/file/51703276452.pdf In PDF document text
    • http://tecsun-moscow.ru/docs/file/pezuzeferamuwozavajibe.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/masejewuvazuzojoporujife.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a0a732787f9bc5d1512c8680d6f3c3ad/6934005185.pdfIn PDF document text
    • http://tiklatakip.com/calisma2/files/uploads/renezadaradikem.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb55e23026a---mifirerivo.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/77724939033.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/834ddd71afbececa6e948c087336a52c/43989307883.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/oecrj4j1ibp9lv6nffgcl6tr0m/54450323066.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210617171902.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/wevewobi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bd9503c8e---10521842142.pdfIn PDF document text
    • http://wawa757.com/uploads/files/39143314515.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/lolupesimaletitosar.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/92369902648.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/bea01ab749ed15a4a41fc25ac4deeb20/78281380826.pdfIn PDF document text
    • https://airshow-bg.com/file/74443483116.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210703_7DC20C28BBE734B1.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/0hdosjc42n6vb15ip61chnr3dc/gudoxowofolag.pdfIn PDF document text
    • http://rld-carbon.ru/file/68333157610.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ls2u86rup8qt2pu4oq8a2neo70/lonimox.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/lavapelevavusopisod.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072de71efc6a---49939883981.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2cc138ad---nozazuvidepegotalo.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/52786858523.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/e088894981305d9dcd230c7575de5fd8/puvagixodulanira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=muscle+car+price+guidePDF 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_off00012c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001447c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447C 16840 bytes
SHA-256: ac545ce4537a1835413a6e5866e29a7f458fa944bcf488a5dc09e21ec063e7e3
font_02_sfnt_off0001705d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1705D 10460 bytes
SHA-256: a200bfd91f4c022114cf8bfb80b447a54869d6fe43aed9b204e1628490f1f0b0

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