Malicious PDF — malware analysis report

Static analysis result for SHA-256 b089cf369f2a9449…

MALICIOUS

PDF

81.2 KB Created: 2021-06-16 15:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3bf873ce990f6488d640617e20e40ff5 SHA-1: c483faa3c660ca82c687cbfa3386941acda1af3f SHA-256: b089cf369f2a9449ad520f4b734071163f5f9f598991a5bb2c22463c4666b51b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be redirecting users to potentially malicious or phishing content, aligning with the characteristics of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://philabc.ru/uplcv?utm_term=gacha+life+wolf+pictures PDF link annotation
    • http://wamer.org/userfiles/file/49751750930.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/nb7cedv6dfjfqp614b9m2rjfrm/natibojexazobava.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/57g96oblpmp3d5bbi2656d5m2l/38503050167.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/61ea46abf1aca36e11097fdc938c41a7/69457155767.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/0530405l1neq4oia76spssqcs8/49553277830.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b46ab5a78fd---lerajuwotakinefakozuvitaf.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/6e4ecb35e3cc4a2e464498cb55e28d16/bebagerep.pdfIn PDF document text
    • http://ubest.ru/images/file/kutimewazaziwofawajid.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/ff2a2a40b2d86ee17fdb4bcdd880d5fa/migidigajibirimeriku.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/zuvipebowinoxabilofobom.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f78a54c85d59fe333d8613634f184116/zibogu.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727fffab288---29021474382.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/78951812556.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd8811304---18307029385.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/68366802646.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bunechgn5npv5g7fe9e7nflfa6/fixefofupev.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/silekedugogimopevurulale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 5000 bytes
SHA-256: 15f537388d4bfdfe739ef32afd9bcee6f357be74d0b2e2a1aeeabefed207fa30
font_01_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 11080 bytes
SHA-256: 0fe9a77ed95b44e0f879f2419a3c96161ca0fd60979865734e121dbf73fba750
font_02_sfnt_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 16164 bytes
SHA-256: 3f70697d8cfd0b9becff5adcad726f9ffedcc5d773cc6f7abbcc82b2f8034994
font_03_sfnt_off0001297c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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