Malicious PDF — malware analysis report

Static analysis result for SHA-256 3199778a1854f219…

MALICIOUS

PDF

96.0 KB Created: 2021-07-19 11:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 179abce47d7ead5731f043189f033da8 SHA-1: ba41a79b9ba969088728d6123a6521ea9187d402 SHA-256: 3199778a1854f2193c858f08abb31c1b4aa4f7531853ba5d5ebc8b2e9b1fab3c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://zigzagontwerp.nl/sites/default/files/file/nutidodemofetafudixodat.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/523cef0767ab06650b923c18d9355ad2/gufulezixubozajiref.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e89d186d---62032050522.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8f411826144aa6a3430b15c936b6b5d5/90598590976.pdf
    • https://zlatartopalovic.rs//files/25704002102.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a9791882dba---9421008411.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/92b320c4fb42efb10c28cf5e37d3b833/nufobijijikuruvarutogis.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8a379dcbb---jaletapab.pdf
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/niborolerodanofozozif.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/825d8dd657d49b3292e0b6551990c2d5/20322045809.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3257ac936f22f2165efccbd648458d94/jibutenenawiletodutudo.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb89dc4b5a---mokijiwemawezop.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6cbaa2103---53053106135.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf4a19528---fujorejodugukesijin.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e1302d47f---vesuwepogasubajepuk.pdf
    • https://glearningsolutions.com/userfiles/files/nemiwosuvexodipedonewi.pdf
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/pumiginivekeruxip.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c36dd196305---9908393218.pdf
    • http://iworking.vn/uploads/files/nifekemewusumimenolodip.pdf
    • https://stmarys-perthamboy.com/upload/File/vavilo.pdf
    • http://studiotrusso.it/userfiles/files/lovobozutuvow.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094a518d4820---zadorejis.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072b663dece1---tekolebororegibe.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3f8741ad376abcec25d048823faac07/91110094165.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723c8936ce8---zojanozonimisodofif.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=deactivated+luger+for+sale
    • 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_off000112df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112DF 16792 bytes
font_01_sfnt_off00012af6.bin
88c339be1969992d7b9b0882fa83081a7eea691fcc8bcb83c64db8146bb1df27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 10712 bytes
font_02_sfnt_off00014386.bin
af3cfb535955a66fd1f507e07ffe25db78c49554d4383d8a778ec6af474db907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14386 17344 bytes

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