Malicious PDF — malware analysis report

Static analysis result for SHA-256 661ef1b5f755fe74…

MALICIOUS

PDF

106.5 KB Created: 2021-06-27 00:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4c0afa1160f56298acf416a1384debec SHA-1: 7cef17884c2758d3e7370238e897646351c3f98a SHA-256: 661ef1b5f755fe74d419da1c9d3945f7f78ebbf56260d5016a21c269d8a40202
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, serving as a distribution mechanism for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://infrive.ru/uplcv?utm_term=red+streak+on+nose PDF link annotation
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b96751a5af---35997817720.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/d20ate335ehrosvftsr4lqmnon/65471825954.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0f527413efba34a97caf19bec288b65/71203283856.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/fexezivifated.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/kii9jr5sd2mid9jesh1itbejj7/23995736911.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/23d9b5a896e0d84bd5250b64d5780b1c/34721503347.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/20638019374.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a2a6cfb0a86ea327c902d968db710172/tinadikogepajigolutak.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/7467a005ebf719c8eb3f90011bf7ffb0/62205319873.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2c7df163512990e6171818032ffa31e/deforonamemiposewepes.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/77264128319.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af9d0bd7675---gevamasojed.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///tibusizijagofazobob.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099393d7ae5c---xojazefin.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3fd4334de---vofikef.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/26091275279.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/db9dcfb3cf2cc5585507c8b7f0e11cb9/36299440279.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/71249521871.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160901865b2bac---xijuvidepapekebezami.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ac26b8a9fa1---71143038375.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/94443134531.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/sawuzixuzil.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/70ddfae5cc1b092903443871eb89bd4c/18047390221.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608568c4d279d---99702459569.pdfIn PDF document text
    • 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_off00013d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9D 10240 bytes
SHA-256: a7e9eb988ceb6101c40cc8cb9fed510a604bddd20e0eeddd5399e154a1bcf8f7
font_01_sfnt_off000154c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C4 17796 bytes
SHA-256: 058dee7b36405695e5b9196c341288278fbf51aa491155ea7dbc08a47fc27047
font_02_sfnt_off00018363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1