Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d528d88c49354a8…

MALICIOUS

PDF

77.5 KB Created: 2021-06-23 18:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5fddc23253dff1cd6c51277bd7544353 SHA-1: 56fad853edf8e3460c9a83b3b9ce4934c17c2611 SHA-256: 2d528d88c49354a89fcfb839f77d5466249d1d33243e4ad2fb937c1e4147d033
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was heavily obfuscated, preventing a more detailed analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/43d0132a706fe5bbdb414fe50f0df616/58441778779.pdf In PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16075e785cd8b9---nududali.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuzubudakuvines.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/80250187716.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adcc4360ed---16506468203.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0c265f001---remudewafazulaxatu.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210616_8EADD5D4681D23EA.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/9vdqjld6th1g7e03ld4tuerpr5/31943590234.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/duwafozawuwuk.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/31450048834.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/ec049775ac487fc362ca3886d7ed6824/85348587172.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/6689649bdb7f49d961a45ff841fa6936/52575939600.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/zisanatume.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160946f2d7a214---zowapefulinena.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/4oml05oub7b69rak173af073jq/52029658702.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ebe3385c4---34103134696.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/38ba761d0a8c11e6406d9f8aea7fe3d8/zumoxezunusivimaje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sai+baba+ke+bhajan+download+mp3PDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8C 5564 bytes
SHA-256: ef57f32f106213a23ef3d227d15e3ed0942ee22d3868846b315ede25b2701432
font_01_sfnt_off0000dd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 3720 bytes
SHA-256: a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9
font_02_sfnt_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 10116 bytes
SHA-256: 3ecac262b60504bb8fd37f8fa5a2a8b72889251d467e15c34c1aedf5bd225363
font_03_sfnt_off00010bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 8620 bytes
SHA-256: edf9758cabfd82d42e143d952c99be7bb9449057cb6d0a1197eeb83653f05ae9

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