Malicious PDF — malware analysis report

Static analysis result for SHA-256 190fa1674ab63b7b…

MALICIOUS

PDF

85.2 KB Created: 2021-06-26 08:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f75b7c3209c1664bdce9f8b68b84a099 SHA-1: 4de4dbd0701bfb8bd9c72344ab60ddaa38a10bba SHA-256: 190fa1674ab63b7bdd621d011926c33292d46a71c83e0921abcac119b25546d2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised CMS uploads and disposable hosting sites. These links likely serve to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=how+to+breed+yool+in+my+singing+monsters
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/803d0583df1bbd1290966dabb847c47c/47635587228.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/810121b3871449b0dd6234e6775c0219/89914217656.pdf
    • https://cmetrix.net/ckfinder/userfiles/files/64461391004.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608179b8e0a66---71236894833.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c79946a8798---21618374177.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160855cf0140a5---85952265643.pdf
    • https://caribemed.com/userfiles/file/8483875830.pdf
    • http://kzlo.pl/fotki/fotki/file/konowemejov.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b9758631a---kagimuretasopojejimuzaxot.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e55da1b41---20323321253.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a2631b949d931f40a2accd7dcf20e0bc/80097873829.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e0988b79c---45022479855.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/11cd39db2f5d9aeade2f31e3bab9c484/45316045836.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/kn1hj4ue751t1b1dnd0hbgqd03/81108533722.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16081b8f9ed5ba---sazezewebaduparivakeluxis.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/cfe9676bd24feab25b080e44562b6297/517962357.pdf
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/vivuxozupezugur.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/22uooe5uj9n0fl8qobbfm5o8t3/vudumel.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824373790f8---46067445366.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/4c6a063a162a2fcf38cb4fab40c6d344/rinujerawifewo.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5e292d0d8---wapixerarob.pdf
    • https://dienlanhhonganh.com/images/pic/file/bifexazufexerivexuvef.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/s4jfb8mgvda4v7aof7sj1iv9cs/wifiniwebixojajakobekevaz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0b.bin
fa6803c8e75fe783183ec54c3f53c788a2d4f8553eb1c64f3ab87ddb5bff66e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 10760 bytes
font_01_sfnt_off00010296.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 16792 bytes
font_02_sfnt_off00011aa8.bin
31a67139269e953b8d761d3e7379e4e7da8e76e493fe9badbcd745647c3e5f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA8 17084 bytes

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