Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe7c3f4740c03fd…

MALICIOUS

PDF

79.6 KB Created: 2021-06-29 06:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 21ab7c77a31a6c2f9ae5f55afc0f77b1 SHA-1: efb03ba10569fb9ae56871169b8c5f8bbc0dd969 SHA-256: 0fe7c3f4740c03fd4661839a0cc60a1c5d46da4071db4ce3d31a5e63f4d0fa5b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://10glazsikeyrosa.ru/file/91615504031.pdf In PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/sofarepodegelijin.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9323421b4---vepufirexesolelorik.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a77e9332d81---63787907259.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1d91bf0f7---6380568276.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/kumagutup.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/fugujebawisunolosufu.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/latoragosevutamonojas.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/zisepanudot.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16085d75159a93---54686331341.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/tinamajiwar.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/lavitaxevakol.pdfIn PDF document text
    • https://mytopics.it/uploads/file/vudedemetekawomonamori.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/mufagatilaw.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/e7bbf6223d5b7fd54affac836fddbf5b/jabinadikikesubugulojaj.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c523a90cb---18068841145.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ac7ef3354---28726560279.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0e39a8e4be03bba0b01fb60903f102c0/gifijumiforexulekataf.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/7016615841.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/7be5efb9d84e9731d21a5cc02d98193f/90214681347.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/fuvusodajanukib.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1f17bdd89d46b372a307c77953ca9f85/72663516368.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/44efa39ce41a199dc5701d724267a6ca/49159760391.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/bidesek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=class+1+english+comprehensionPDF 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_off0000d534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD534 16684 bytes
SHA-256: 5f02f8fab1c095b286e59a987628e65241b599747837d9c21c2a97909b7da753
font_01_sfnt_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 10804 bytes
SHA-256: 7b1fffa16ddf22de3006b4dec0ff0b2f440c78d6a0875e6d607a86714029a535
font_02_sfnt_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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