Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5437e6b550ec901…

MALICIOUS

PDF

98.3 KB Created: 2021-06-29 00:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13d4f120e2eae201d1d9e17787627819 SHA-1: 99dd6d0da90d0e263b82849835160f4b54a627c8 SHA-256: b5437e6b550ec901cc96405b1a4b6ebc46536ad5ce806e7d09a0f37fa67c1bfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and heuristics indicate a malicious intent to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/n5t74c9mqimrlic5sfgen481ii/luxuk.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b91472d9ae2---vazulabemawafixawure.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c35065a996d---40218623295.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb78893f8f1---riravipuwedej.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4dbe5e89d326019f3096947e6dc66005/voxilaguxakogufenosaf.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/780fd0163b16459b34fa57be45a97195/73868346498.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/511168fcf89dcf0ef3a0c3241e43bb11/fakerimamuzotesil.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c89398c8---nilotubumivokuguxep.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609670ebee729---kexumarorez.pdf
    • http://allamericannursing.com/userfiles/file/61301794164.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e633ac905---pokekalemobuzevapigedegon.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e42d653f---ronigoduzusibemoriza.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb0b9a0173---juzaganedixabasubinexufew.pdf
    • https://villatoscana-pi.it/userfiles/file/pewakizedogajijisurapup.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/a964f7b2bced380babad0d770efb3e29/69446665212.pdf
    • http://billsky.ee/files/file/33470555861.pdf
    • https://chpcentre.com/files/file/ginaxosivuzoworewet.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608395c06ea81---vemaz.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/mopetironabo.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2b6373391---pezotewakaralukevaxipu.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f5f31099f---kujanonofufebibazo.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c4032e682---75598519832.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4a03c28123f5dc8800e0738b8513c9db/17232561719.pdf
    • https://batikatravels.com/userfiles/file/97091883775.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9920dad22---75274217910.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+draw+ms+marvel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a50.bin
7df10dc5457c2cf3326e2f6bbc92110a842db15f0ff39cd83bc1bc99a0144ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A50 19036 bytes
font_01_sfnt_off00014c90.bin
b5e5529af94ed01b2bddbf10e1bbadff4c57f8aa5796bcbc8c0967d7d3de2dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C90 10356 bytes
font_02_sfnt_off00016407.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16407 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.