Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cc7ac0c895eee1…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 00:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3043eab6efbd778016b729f904588024 SHA-1: 887d96b258a503c26c907fe07230d4407a71c4b4 SHA-256: 39cc7ac0c895eee14313f8f1e23b9cc4019677b76993d7eda0786cb09cb2959c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for phishing and malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://britishcytology.org.uk/ckfinder/userfiles/files/96335911648.pdf In PDF document text
    • http://lulanjina.net/upload/files/vukaresijobewazuv.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/kovivasazi.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/91639550162.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/28709909406.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/87486775304.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4b3f1f41f612aa2edeacd30fe00ca7ce/3674786335.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/17710821781.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e434eca9b---pemolofibekojar.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/54129054299.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/19027511047.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/tapifufevovalogiwa.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/fojisetomizif.pdfIn PDF document text
    • http://etre-belle.su/images/file/35907286754.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/52895002191.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161414289a21fe---vatarodo.pdfIn PDF document text
    • https://phukienbep.net/media/files/tojazoponukirezopuvopap.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/93568159688.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/jewerexemefujimijuj.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/lesapabotoli.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/69508250038.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/25640129283.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/12688211951.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210901161703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+extract+zip+file+in+android+mobilePDF link annotation
    • 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_off0000d236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 17848 bytes
SHA-256: 41e010019b98267cc2fd49818286d0a32e899868ff6267f8f9d3adadfb392195
font_01_sfnt_off0000ffdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 10992 bytes
SHA-256: bbfc1f1101e8080f6b09c5d7cca9ef2fe439744330c91d724bdf8f82a1a12516

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