Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84d891bfd7de1f9…

MALICIOUS

PDF

91.7 KB Created: 2021-08-08 00:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39f04a5f4dedb5bad12a32b7fa4fe244 SHA-1: 131a9f346939b9f2828dd2dae56e7d34c76ec27a SHA-256: b84d891bfd7de1f9f169df3b4240a4c4bc66ed4e48831f5f9a6428a81e5b1466
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://pistant.ru/uplcv?utm_term=cuisinart+supreme+grind+automatic+burr+mill+setting+for+espresso PDF link annotation
    • http://bouwbedrijfansing.nl/userfiles/file/wogofadi.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/5h380prbhargjjhus535u586qv/tedevugej.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/74e83acddd55b66598c140b67a6a701b/zukosoti.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/xotiwisivovomixabot.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/39160990718.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/eaf8d0767c7d793de46d439ff3e59155/32683893333.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/fupij.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3506f4effa6f78e117e600a0d3770dea/40813592143.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/nizexivazexosawo.pdfIn PDF document text
    • http://planbmedia.hu/files/27665357995.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/nufamezazufakodipatuwu.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210707214239.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/221ba868887237ca31b12acf7bd8aae4/77811075849.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/caefc387f24bc719febb5b39e040a57e/vufolavexomisilikibu.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/gobatatepegagifez.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/donefususamatonije.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/40463669974.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b63a6aebb07---22173464251.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a8061c743---5086872962.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/d6riu436h06ih4qk76ha63u8fh/28432128019.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rikj3plsatto89oh6asfnvi801/86440632049.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/67983650104.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/galixixifotumikevi.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/zanad.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/dopupezijowebi.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/36948819680.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_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 17004 bytes
SHA-256: 2d13356335f830cb027062638983e608ebfc796972b5ff93899d60ed07c74b31
font_01_sfnt_off00012e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E53 11236 bytes
SHA-256: 682043f6f40fa6e7bfb0dc1c52d65956ebdeea0b92ed2bede09294ec19292b8d
font_02_sfnt_off0001483b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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