Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de81568a174697c…

MALICIOUS

PDF

98.1 KB Created: 2021-06-26 09:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 69752bb21d0ef3802ec216d74d71db6c SHA-1: 428d11d483273cd34beb840f27713797d7c98404 SHA-256: 8de81568a174697c83d731d7f173d4ad9ccfb8c5fae168ec35714d5fe67dc72e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links are likely intended to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

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://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/cad3e507c4144ea067753d04ffcabdb5/webopemubabobuko.pdf In PDF document text
    • http://project-lovcen.me/userfiles/file/82407150040.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a491885218---fizokujagiwabepofebi.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/20e958b8495d89ab5bf90efb30e6b3b3/xivob.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/dcb53f5c1b83512ad8432d935fe671ff/fivusik.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/dd712a23e2e68facde7b4b2d178edf66/66428557570.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/339jv7r2cdukm78cmrd81nmfqs/magopedorodudajukopodefex.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/98270310338.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/padiper.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/5d92bfc52f827366856a9171218f07f5/46740366049.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/sevila.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/42975473298.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee467d8fb---tojagiketaberuvanoporeso.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/626eb6749c300b089cf34ad263c5e3d8/61957970130.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885caf3ee7e---subow.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/blftgpsprr4o4g1deiacuqrd1c/3380708128.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/71b4aceb6abfa0970deb3258ed113d97/fujixirawezenexa.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/doligixopanuvunukoxajom.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/kiwusabifojejubigiselejaf.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/sokaruraxeleven.pdfIn PDF document text
    • http://leton.pl/userfiles/file/rafamibatovejodavevuj.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/93289924151.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/59119080570.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/5a98a4d55d93637c83b3a8d17adb115e/redutafisojewirumi.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/15281220544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=imminent+meaning+in+teluguPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001447f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1447F 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000e559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 24164 bytes
SHA-256: e6f1d4978c9f0ba9bc0bf631e64ca1b232279a5b97681f9fe271b55885d061aa
font_01_sfnt_off00012094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 10116 bytes
SHA-256: 445371f69e1aca9bf28ef472bc74663d01a32447912e3bc61ae6a2b99b20a532
font_02_sfnt_off00013705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13705 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_04_sfnt_off00016220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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