Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c6d0a9555fab71…

MALICIOUS

PDF

96.6 KB Created: 2021-06-28 13:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce6f7d281bb6436e18901340be23b2bb SHA-1: b65049560b29310708ebdd93a7729f69e82f53b2 SHA-256: e6c6d0a9555fab710766f710010124f773f2b9b74eecc4e27ba722bb5f4d40c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to compromised WordPress installations. This suggests a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://drafthe.ru/uplcv?utm_term=first+cesarean+second+normal+delivery
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0993ba7cfc---gabajasowoxamevefekamala.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/fc094a0b0a1111014eaaa664d517e8fd/89260176389.pdf
    • https://rh-h1tapi-turbo.com/contents//files/zuwezeza.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d1196be81---79801178150.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/6lfk86vlkg3dq8c22mr376mklf/xewara.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ca386122fde46677b06af94cf78066bd/46861135134.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bea697e70---ridomikitobomadanopop.pdf
    • http://energy-labels.com/userfiles/file/74783341134.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/74e73739b57f9b4e7be7dc2e04fb58ba/nezuwabamofebogebogu.pdf
    • http://tlproduct.com/userfiles/file/netogopomawimexe.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/samj53387ikeaboj6kai9v3oa0/22078965920.pdf
    • http://fruitvita.com/files/files/52779406751.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/996bdb10fa2fe45f5fc650dadf06584c/68403850631.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b8ee241e6.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8e77b75fc30f59036db0642d753cbb40/74253764776.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/94865211011.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/u4ocmqmf7d9ftabj5jnaug3jbd/63054166938.pdf
    • http://yilip.net/userData/board/file/firilevovalawaponuv.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/61693cdd793bd78c796651cdc1a8c417/78163726755.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa049c86d28---dewivisisovipomo.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/3f10aea9f8cabfa9d227f09cfe8b4631/potuderem.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6e249fb3c---gutozofimutufifemisikifax.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1b42d236---gelekonebabuz.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/90a5942fd9c56825597ebdc785ada17d/4624094597.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117bf.bin
a8cb12de24d80be2e1e52e1416c55b0ffdc5faaaa64833742c067cdf9a0fe4b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 10688 bytes
font_01_sfnt_off00013045.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13045 16792 bytes
font_02_sfnt_off00014857.bin
b611fbe02a6d49eb47dcab5079ad2720776ced5228783fc000e93cbd75efb2f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x14857 17008 bytes