Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbecb8bcda5d1d7c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 17:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a49478e4aa1a1001be1eeafa6a97f46 SHA-1: f23c2a083aa622245b077febe1076c2dc9f8306c SHA-256: cbecb8bcda5d1d7c4e9d3ddbd82bc69f37da485f72af8ac5e1ad41bb8563cb14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the embedded URLs themselves serve as the primary attack vector, directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=projective+and+injective+modules+pdf PDF link annotation
    • http://umrllc.com/userfiles/files/36475897754.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/25ebbd671d7d0866d8f421f941a1d6c5/42525590354.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/sodedopal.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/xunemalevirotalasobevalo.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/47372079335.pdfIn PDF document text
    • http://computerdoki.hu/user/file/sijud.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/10d84b8f6a613f3b9491e33c84aa1787/kibutoporuborexegi.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a78b7cac77---komuzasikonutiwi.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/b1mflp0rebgb12moef6hkr7vug/sixofanebum.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/a7bq8j6u4ac7a2o3c08mi1a0vu/nugemeri.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/sfgom157srrh0g4a137fhvt620/90971631427.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161292df83f513---47886551117.pdfIn PDF document text
    • http://17njl.com/userfiles/files/kakadita.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/65693845073.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b750f4e30fb---42705197491.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/4dc5ff46440fdb20632d0481ce7c4430/52388614195.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/de2352388f2f6b48d325ba18287be753/21587299670.pdfIn PDF document text
    • http://ahchala.com/img/file/momarexadoxaserujosobini.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/larefunafevogewezujadir.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/33108522316.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/doretu.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/72374267899.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/24932432274.pdfIn PDF document text
    • https://gilbertems.com/videos/file/60263314775.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/34392432708.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_off0000bf94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF94 11080 bytes
SHA-256: e6aba173466c7fb67cc6c5ac3bf03090cb4df8c366313fc17bbbf693a8fdaccb
font_01_sfnt_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 16964 bytes
SHA-256: b9a4b24a85bf2b81499fe31303c117a74e2356ad8d3024640fc7d32470dea747
font_02_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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