Malicious PDF — malware analysis report

Static analysis result for SHA-256 f787d06e983e5aaf…

MALICIOUS

PDF

88.9 KB Created: 2021-09-03 23:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e4c558c4eb546d9744341d55796892ec SHA-1: 1c8f3b0d777b605232dda367346b9693c60bcab2 SHA-256: f787d06e983e5aafb9971c199c77c352e766332c294126d8f3d9b2c86255f636
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other domains. These links are likely intended to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e592edf11---73443006797.pdf In PDF document text
    • http://www.contectrade.hu/fckfiles/file/27527378376.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/88535309897.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/4480070286f4ddb5bbba698e636a62f0/93596676344.pdfIn PDF document text
    • https://mvservice.it/file/95617696790.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160de4b4d178b8---11008551644.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/75618592738.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607347c151ac4---mufodekixazavosukojijegem.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/luzosevajeseguferid.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9a8bb673d9820f2007001229dd863cdf/sijum.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/11514103756.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/sodij.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/zibomejomeninip.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077da95dee4b---38424562758.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bca6b03558ad7d365949457d96055c3b/7295159551.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/fukefitar.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6c43aeb5---fenin.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210622_F96203CA5878DDCA.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/85411975937.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/dojebuzosetowaxifi.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jiep3lf8inseooe4p2rmb6cij5/87516446053.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/25933088659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=marketing+case+study+examples+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 17984 bytes
SHA-256: cdb27fd81f464b0c8a70027b8b4e3de7f43396ee55089b0068a5b4f80571492d
font_01_sfnt_off000123a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB9 11244 bytes
SHA-256: 88adcf6310807a37f5ad64565e5ebb701586e05688d27b449e4efc7ab127b835

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