Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4687f37881dc97c…

MALICIOUS

PDF

73.9 KB Created: 2021-06-26 05:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c07df796cc751acfce0a2ec85e9efe4 SHA-1: 82f50119ff976759187a9d3037586f1a880ae5d2 SHA-256: e4687f37881dc97c6cf5d6229f037d9f0b1b2738dfe0393652e13fa26e7b04db
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://afayl.com/userfiles/file/12194572151.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64d3b3551---towamovidewi.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078d88e1ef7a---didokow.pdf
    • http://oticonshop.net/ckfinder/userfiles/files/10684747522.pdf
    • http://szzxwx.com/Upload/Upload/file/2021613114317746.pdf
    • https://ville-saintleonard.fr/pdf/powubibarazapinozowixel.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607078877e664---zidifoxozuvikukimudopafus.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609849532c62f---82434366134.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6765013b9a---dodikomugo.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/1f9a45251e1cfd6cb570f1cfa5dee0f8/29852906242.pdf
    • http://bendhorseride.com/userfiles/file/febizibasunodedel.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ea11d6dea68bab8e89b19d4b7c9b2bc1/94830376423.pdf
    • https://vinadesigndanang.vn/uploads/image/files/dojajefexamovejefimigeju.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/5bd9d8ffffc6d17dba036a70f30616d2/guronolepugiranasagero.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c8790347802---13890641395.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9b77edeb---wafafekuvogipusid.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/02d199b1ef090a20f28b8e6aff39546d/99588469925.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9d6642f0b---24229404011.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec3e7bb4e7---92480886068.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba9e53138---23486637166.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3625b5b92a082c13169d39f435105d19/6739493485.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160946bda8cbcd---sojakuvupufozami.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/99355740920.pdf
    • https://batikatravels.com/userfiles/file/sipuzabulodovologe.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/emts1ijo3hbkkg03tkq18d0qf1/fonemipifexoxutusebebemi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=orientation+meaning+in+bengali
    • 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_off0000c02c.bin
5110b9d77867e2d4f849b6abb692ef938e161154b091a08fe5303de1db8f737b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC02C 10448 bytes
font_01_sfnt_off0000d7d5.bin
57b99bbbedeb550aeb67bd1c26f93392ff87f1a287f2ca1db60e4f73f461ce32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 16396 bytes
font_02_sfnt_off0001022c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 16792 bytes

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