Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bb8f7e308ec2ae…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 03:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 9f6cb8cdb6b9103aec22bf4af3f6cd46 SHA-1: b2a6329f8010ded15d56fd976ccbe3f25a3b9c4b SHA-256: c6bb8f7e308ec2aeb7b539e49073f940be6eef8ac424b8f8259a9c87eb50d00c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document instructs the user to open a password-protected archive, a common tactic to bypass gateway security. Multiple URLs point to compromised CMS upload directories and disposable hosting, further supporting a malicious distribution pattern. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://debandhelder.nl/ckfinder/userfiles/files/gurolij.pdf In PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/eqmssou6uhf7en86oqmn29re9m/88905520840.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4758e544a---sajemumuli.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e3c2b6ef---boboduku.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/gejifinukilefuwari.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4752827d9---visuromalidevuvufofuva.pdfIn PDF document text
    • http://blueyee.com/upload/file/272016189364.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/noxilonitekula.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3tqtibg7qed4gl5rrusebnflt6/48475306878.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/lunexeneze.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ltn2du5tmoq0aqcbengac1unud/linosiwax.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/krr9svu6mgbjo348k16gjaqba4/rubaposulaxunurawevom.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/20145353338.pdfIn PDF document text
    • http://sparkpro.lv/content/file/rekejemiwitup.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/28756466204.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/karokerefaw.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca2226f072---89341492543.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/59313875432.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/vazedikito.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/29779258160.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/48094480381.pdfIn PDF document text
    • https://lemanssrl.it/file/54656706175.pdfIn PDF document text
    • https://togeltop.net/contents//files/13562386514.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a06fbbcda59---50936355053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=importancia+caracter%C3%ADsticas+y+estructura+de+los+estados+financieros+b%C3%A1sicos+pdfPDF 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_off0000d373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD373 17376 bytes
SHA-256: b373e4ce8099531d0b69db3ffe24b2ca002adaf9f7565b9d400772df056850cc
font_01_sfnt_off0000ff30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 11328 bytes
SHA-256: bd55bbf9f2b74328267a864e17ead653254a3339ad03a5fa25d7d2eedd5274d5

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