Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be14d8ad30b3879…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 03:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8000bf776e182b5833b2151526608266 SHA-1: 8c79615552a441b6aee0c5aec2f7ed7541e3ea32 SHA-256: 1be14d8ad30b387925ca2e66d3afaf6ed4d84b6a93b84e245e1e37caf4fa8ad2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://windmill-bv.com/userfiles/files/gesorexiginawinujufuv.pdf In PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/vusupigajaso.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/nijumuzokobejukagoju.pdfIn PDF document text
    • http://carbontuning.ru/file/xibupunolezafukoro.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/paximaxopixuz.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a083e08bd---vewejukivisanifunirere.pdfIn PDF document text
    • https://clickbox.ro/images/file/88302357884.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/22645316818.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/gavovunudajuli.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/97523697308.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109020558241461.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ln8t4148v0tcvjkmmp7qtk4n12/towezijisiravojibamu.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/nexilemukojoxupiki.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e200b5c249---wadejelulufujewexuku.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/v6ov385cj7i8p3d623gdg79odv/95955315428.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/7a408b04b34d822a8ffe62ec9c2ca0a2/vasifujirob.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/2144944453.pdfIn PDF document text
    • http://teifsepahan.com/files/file/11779559284.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ce3d8623a0---wefediwavugopajuzabi.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/zepot.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/jotenekumemukim.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/6616089921.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/somokapepafed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cateterismo+cardiaco+pediatrico+pdfPDF 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_off0000c424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC424 10660 bytes
SHA-256: 22f461ff36e1bf9602c555f17a9f578716d8dbdfa431c42c20af3a47d3e4c5e8
font_01_sfnt_off0000dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 16788 bytes
SHA-256: 50a9dab9ca363684671608890bd8bc454a86b274ae50ca66c66871a3df776fa9
font_02_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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