Malicious PDF — malware analysis report

Static analysis result for SHA-256 84666e166c6f6bd2…

MALICIOUS

PDF

89.0 KB Created: 2021-08-18 07:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 10fc1eaaf111de1267b49f7d1db81476 SHA-1: dd3dce72815f936c2cd7e6bd1384e13688ac42f7 SHA-256: 84666e166c6f6bd25e8e5fa9dd7849b9f2dfa5ba7965b7a5718da4423aabf9c8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, suggesting a link farm designed to host malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, possibly containing a payload, after providing a password. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/d5958b6df79c0bc095ee53b9aa7321d6/vulugizo.pdf In PDF document text
    • http://herve-coiffure.ci/files/dedudofevedazivijade.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b6b0d3f42---62040577252.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/74023254558.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/wewimafevegadugetutowilen.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/94248887356.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/tunimapufet.pdfIn PDF document text
    • https://dm288.rs/slicice/file/sanig.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/silisex.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/4440a9f16311eae9b44486d26317c29c/79666360431.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/janigafuzumuxo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad09190a56e---45411307664.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/zerifapesorubetagoda.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/09306fa5945178df3c115e7118a1ac95/raxuvivepija.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bbca8cf72---10810364544.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/sezimubavubomovuza.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/68435092804.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/a820d0a5474e6aabba6928809c2582b1/buwebawog.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/muwamoreserobaz.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5110e1569---vabudazerenokezozape.pdfIn PDF document text
    • http://gotween.com/userfiles/file///jubaseta.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/janiwagowurodozeva.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/detederetus.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/1491f7cca1c62d73334f92f0fb977900/98609670899.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c815eaef38---nebet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=libro+de+matematicas+3er+grado+de+secundaria+volumen+2PDF 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_off0000f3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 18076 bytes
SHA-256: 6de66b0a3aef7e5991ea9822d11e102f0a747c3aa330ac74d322323f7f43359d
font_01_sfnt_off000121b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CF 11268 bytes
SHA-256: 86d99b3792aa7b00a94ef64efea958a35a50fb5d634dc9f06b9a089984642586