Malicious PDF — malware analysis report

Static analysis result for SHA-256 5591ced872b7f09b…

MALICIOUS

PDF

92.9 KB Created: 2021-09-15 18:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2cff1892b0317d74522b31f999b7b004 SHA-1: 3697fcf11fd893a5c7f0fe348f9c0ad2ae8773d8 SHA-256: 5591ced872b7f09b8555e4ea1b04bf0aebd5f933af59ded555171a7398b388af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs that point to potentially compromised websites or link farms, suggesting an attempt to redirect users to phishing or malware distribution sites. The presence of these links and the overall structure indicate a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=twilight+full+movie+streaming PDF link annotation
    • http://plenaseguroseprevidencia.com/fotosempresa/files/67632275932.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/75097842709.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/pinejalitegoloxagajalade.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/zawaruwakizola.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb13a94ea1---galifigerekedoxuwekaz.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-3/20210903125112211908.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/pukitekevasujijif.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109060232215387.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9e9437cd1262446b4aa631e927627f2e/norumatalufuzesaxuse.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/66684294ac3a2688046428b51222e240/26156229040.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/pajizudepaziw.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/g65dupb4bei4a7l5n2rbjg7ja3/zevedikafizakol.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/talapavuxetejinedepa.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/bapifalutozudotofet.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/xibini.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/fakanivegozada.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613409a034229---kixugasudapobufenuj.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/4390038136.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/8747780087.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/4828584385.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/05f32f0ef5bac26a2eefdfd674d072b8/dupafiwid.pdfIn PDF document text
    • http://videlec.be/ressource/file/gakabikezafabunigenuloj.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_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 10876 bytes
SHA-256: 5904ef92400f28b1c35ade95c3ceb058e0b63b721546f9d65feca5d8d1e9486f
font_01_sfnt_off00011c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C45 18972 bytes
SHA-256: 5585eaf909c93d81521ff158c944800cd41b3b34673d1fe516548391faaa4432
font_02_sfnt_off00014e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1