Malicious PDF — malware analysis report

Static analysis result for SHA-256 3153728d4cda749c…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 01:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b57f3d0cc9336236c66e026e142266c SHA-1: 0dde03a8189d4f28b6ed7dbe36237a8d15a67b36 SHA-256: 3153728d4cda749c97d4bd40d37c822cb2d579dc9638df41a30e2ccb27cca3df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=what+are+some+of+the+ethical+issues+that+can+arise+during+a+research+study PDF link annotation
    • http://sisparts.pl/zdjecia/fck/file/18900576517.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/36864897578.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/lupuv.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/nugipam.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/xemonununisuguki.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6242cf12---71840380270.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/89346597280.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/48171470976.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/4750267454.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/fiwutuxarajitas.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075773ecd52a---92459991081.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/lpacepj2qgt9tuogpk1sbroob6/losadupagobawodopiw.pdfIn PDF document text
    • http://kimthienbao.com/userfiles/file/14921571812.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ina8ec0b14vpivvbaa7e1rv4t4/naroxupizixanewavu.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/69798003363.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80f5ee287---51954894961.pdfIn PDF document text
    • http://jaika.in/images/documents/files/xadapimoveminiziset.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/57104123045.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075633b14579---52294788500.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/41270921052.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/77181625627.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612359fba892b---50184450717.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/28587866980.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/21038394922.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_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 18268 bytes
SHA-256: ba9bef742f2a1150dbccec92643f57696de1d964a18e903851e295b8b5be4bb6
font_02_sfnt_off00013027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 11132 bytes
SHA-256: be8f6aacd7e10639eefa39faa05a457b43dc7763df7cddbab94bdf3773d6dc90

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