Malicious PDF — malware analysis report

Static analysis result for SHA-256 88abc246167b9358…

MALICIOUS

PDF

92.1 KB Created: 2021-06-26 03:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06dcbc4199a043cbe5e3f2da7b428b52 SHA-1: 84d74508bf9bd6bf6917d0f2e738a359f916fb37 SHA-256: 88abc246167b93585be63fd2f691c9fc52b35cbaac84885ec4ba1be04d8c3b6c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to other PDF files hosted on compromised WordPress sites. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially leverage SEO for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/364mbjra7jhea4ec4qabk8a8g4/24238312663.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/15d3af2f8af124ea776f0543b7cd12b5/sikepinuli.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1fc948c6a---3417967797.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66ef387342---27126900630.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074c1ea83e9f---79492958006.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/kmf4onfarr1jr6a8bvabis74dn/28258816614.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ad8e475f1---pemuxazarufanusakuva.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c2c62490f---37643218009.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/8a10e2cc48cceb1ea5c4623853a2c527/83760532950.pdf
    • https://alakharia.com/public_html/userfiles/file/jixiz.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070720e2ed4e---10431750755.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609005d054f73---48915374897.pdf
    • http://alt-1c.ru/userfiles/file/25010474354.pdf
    • http://laclonghotel.vn/upload/files/98981885103.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b752dd0f6---82332348674.pdf
    • http://analogsys.com/uploaded/file/39732398160c71c6461a9e.pdf
    • http://huucodatlanh.com/userfiles/file/dadexuj.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/a7a1e68d25c809345ee1505ce554bf7f/xideris.pdf
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/73705814840.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5911c0b2f---jogamem.pdf
    • http://www.darvidproperty.com/news/file/nabun.pdf
    • https://bisnismedsos.com/userfiles/file/60630157253.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c14a2299f---dikurapetibunugunalona.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sonic+movie+green+hill
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef87.bin
a2185b3ec4a0061bbec82c5a6c6e6fed56eb4d6e6c3286c4c8dbe598455989ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 10392 bytes
font_01_sfnt_off000106c8.bin
abafbfb5f2ae860904b3829bd5c1a414e65b03efceb479c7b07b04263bd5f5ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 18916 bytes
font_02_sfnt_off000138d5.bin
55408cbf3c6346b696d099a0cf4f4adbfaa2e93c5d20576fea12e792915ed497		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138D5 4324 bytes
font_03_sfnt_off0001494e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1494E 16792 bytes

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