Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d234b617f48463…

MALICIOUS

PDF

85.3 KB Created: 2021-06-29 20:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3ae9d641214c5df54b1fbacb377b5cf2 SHA-1: 052da483496351ee9dc0e7a334081f9da255c097 SHA-256: f6d234b617f48463a670e0d6ed2ac2eef270a4656d2c9f80483b5dad102de950
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous links to compromised WordPress sites, likely serving as a link farm to distribute malicious content or phish for credentials. The presence of embedded URLs and the nature of the heuristics suggest it is part of a broader phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://medvor.ru/uplcv?utm_term=immaculate+mother+of+perpetual+help PDF link annotation
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e1c62cf0f---joperuvenefepudibetin.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/32359633274.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29a6d38ebf---86488153978.pdfIn PDF document text
    • http://mopron.ru/upload/files/kusofivuvovasabozebi.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa1cd624e---xaninonabu.pdfIn PDF document text
    • http://temple.mo/userfiles/file/zipuwatosezafolop.pdfIn PDF document text
    • https://samowar.me/userfiles/files/47735459142.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/31913030836.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/8870bcf1852813e25e249ed90614a889/1444583410.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a6a6828ab647873702caed2d1919b903/4356357513.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa489244e---lubexugisi.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/60c8df5b869635a2c109f8ee2abac29d/xutozamoxuzupumizatobo.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/susugojo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087113bceb87---wisanirudewezabusepos.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/14667694461.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/86789236632.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/73246137060.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084e2aaaf296---86979579612.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/fapivedudodapegi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/18dce413e9248cc1629484ed1c6fcab6/jojezupijupigatidega.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0a8f6d7185dcf9fcb4673a23c37d0b83/zilelanu.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/c9f6bcddc288d75b0f5b10fc925f9443/92221108031.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad639f8dde9---lidipuxifesixoverud.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfac9b618e---gagupe.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/meduxadopovusa.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/abfdd32b37ea92289c5644d2aea0e3b2/puxemob.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_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 17088 bytes
SHA-256: 63a71f277d5d3fb09c5d134011cfc7f5b6ad82e1c10adee10bfc2ebb55b00254
font_01_sfnt_off000117e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFB 10432 bytes
SHA-256: 693ed51e7252347ab6e9bbb9b5e20abcfe37991d965555bf40f8f843c9d1a935

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