Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1da799ceede3135…

MALICIOUS

PDF

145.9 KB Created: 2021-07-07 05:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5e213099d8240ca25ec448ec8fbc71a2 SHA-1: 343121c16d54a590c7cb85c0fe8e1d12f7de5493 SHA-256: b1da799ceede3135cdb97918ede8171e5c4582845caa0227e863ee24b09d7043
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely serving as a distribution point for further malware or phishing content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to leverage SEO for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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=architecture+and+tourism+pdf PDF link annotation
    • http://chiesamadremarsala.eu/userfiles/files/94820694768.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-6/20210506020936532731.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b87e96543f---gomawube.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/rthi5bmf4qv6one8fmlr29bjt5/63858082072.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/hrlq9fou0hnvvrsve956dh8paj/23983603596.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/26121214495.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fd6f7b912725cd9eb122ce0ad5fe678f/pijovexemokavepituvotexed.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/f271e9991854a841459866251e465d47/benibaviliforitowolipef.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc53c787bc---leseduvalaruvo.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/9456036173.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/88532a4ff031294f220bffdac4f64c89/35768733187.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16198623925785.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/fghe6mpi576h0aq2m8t8kf8185/nurajolumafiruzigox.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/lodelotezosojuwik.pdfIn PDF document text
    • https://ka-base.no/images_content/file/50194865365.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/puxuxavizutavopegusikixew.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/nerizitumux.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/cd86c4d400da76ff5de528444fb09493/52924339759.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/notufowodeko.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210603044608.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf1bc1486f---dazubetipuponixaliwune.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c58b496e3---8398466726.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/88786511220.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ga5vmj1u4up7itks4avkd9tsmn/59838011593.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072528293ce1---36849422152.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/888f3b9a43cdc40f19efab95fafc35f1/megesomuf.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_off0001dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F433 17136 bytes
SHA-256: 13dc2ccac68d8b58d80a39c5cbfb49d992d81292c71b462b27943bce1b3a69af
font_02_sfnt_off00022070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22070 10920 bytes
SHA-256: f4001e01e9b90a2b3df689bb9fa4eeebbd61e5d193f4cdeb0aeb14a5f2ff4077

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