Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc18f05b462c2b90…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 13:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf59151c6faedfc498c651f780df35f2 SHA-1: b662005658d2f079cb4aab562034c76cd22d9884 SHA-256: bc18f05b462c2b907de6bca9dcfbaec2fb72f53cf75742ac6992783ca65c7dc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which are hosted on disposable or compromised platforms, indicating a link farm designed to redirect users to malicious content. The presence of external URI links and link farm heuristics strongly suggests an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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://wastran.ru/uplcv?utm_term=is+android+a+platform PDF link annotation
    • http://zanethompson.com/userfiles/file/46874961845.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614888a815beb---98226173208.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/gikido.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/16825666400.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/33142270229.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kdhn04er7f21mkcn6kk5oc5ns8/68742783047.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/79399751168.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/mibitajugemubejononu.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/b07o5jm0qs7v0a4nag22sbbjeg/jenisunuvolevufa.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-09-05-34-20-49.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/40cd031982c5874632e0249c0519b957/49499556605.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/93022350405.pdfIn PDF document text
    • http://miminku4.com/contents/files/sagavunavefumomoja.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/v9m8535sgv1okonmoimltov5vd/60160800465.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/82161301112.pdfIn PDF document text
    • http://elpijisystem.com/file/xelaxam.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/67547336927.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/febidem.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/bafizonixejerozidujuj.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210912124509.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/33235892975.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/67213303807.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/76885104075.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/mejusetiwiwimixitizewag.pdfIn PDF document text
    • http://someteme.com/archivos/_20210906224933.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/gewavunazujigubizizap.pdfIn PDF document text
    • https://mattress-leader.com/media/71086808183.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/33441444402.pdfIn PDF document text
    • 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_off0000b8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 16420 bytes
SHA-256: 29919e177d91e93e4297ac413b31defd3f98aa0a98615fddbdd53ec3848ffe6d
font_02_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 10476 bytes
SHA-256: d0e541cf3b594b512abd6310e682f38ec0036c8f6a649cb892a4adc1529466d5

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