Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efdffbcdaf8be55…

MALICIOUS

PDF

92.7 KB Created: 2021-09-03 16:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d17542214c041f8f32a5b447a3febba7 SHA-1: de49b6a335c39e25ba5ed8fd5d187a52f225acf0 SHA-256: 8efdffbcdaf8be553a2ca7b4f57f727a35a605f5a5042ffbb573ebc0596b3e79
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of many external URIs and the link farm structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://archism.ru/uplcv?utm_term=colonel+bogey+march+sheet+music+pdf PDF link annotation
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/parezavimezewiv.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/mifuti.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/129bua4i9u04h3h5pmbodein0d/tubuminupiv.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/penaviperuzoz.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ebaa89db6a213c7d3ed70176eb2ef5d/28984698670.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799c8ddf8eb---21369948539.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/2ef58dbe68d0424510b5015d21449591/14791209438.pdfIn PDF document text
    • http://waterreducer.cn/d/files/bakefikunikewubikiz.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/memetugenaxesesa.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/devanivolapu.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/2a866430f3defb0fe831bfa80e2c9111/64011600781.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/635462bff6a742e8e73e56a398945b08/subomifonozenepuje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5467fe7c22---wuxutofuj.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160731b69ec032---jewawumu.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/dewebuzezusuzokaf.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c574b8d2e---gizowolabase.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/5595633361.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a8c359d4b---29785410802.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_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 11452 bytes
SHA-256: 745b584329d61f3c399e134980d77eb5475d0d42b616e9c05f138d270da0e374
font_01_sfnt_off00011bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 18952 bytes
SHA-256: 9beabaac9557efc0d1a6dfafd124d986662d27d16a69f68b4a4d05db8576aa43
font_02_sfnt_off00014dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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