Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ee0562f612b929…

MALICIOUS

PDF

86.6 KB Created: 2021-08-06 17:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7ffc5f68b2a72a3415b73927437db69 SHA-1: df6f14be75a310b826faefa774c7aee481a16ecf SHA-256: b6ee0562f612b9290b9de175763b090940929e566b04a19bc2879444f2e06a9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external URIs indicate it's likely part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nomylo.ru/uplcv?utm_term=boat+licence+application+nsw PDF link annotation
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/990631102.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a119f0b5dbb---24555628742.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ced18d078---74777966157.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/e731843649de5a6b6dc40134789b49c8/jebizixoveredowawanabefan.pdfIn PDF document text
    • https://foulardfotografando.it/file/59217808326.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/151f9d25935dd710bd9e8253d14e6013/pexegodaf.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/runiwefixajikogol.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/lezezapulesinetosusejorep.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/42157088000.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/42203546261.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/kotigejisuwugavesafa.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098da93f103d---16126541144.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/bexuvanumokusanalojateben.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/navatapumewurerotigilap.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/biwuwosavitavimipidifazo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc5768aab7---lulikofezuwamalonof.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/29334004507.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a758b5eddeb---36784384926.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4a8b74d8f516accf1826d492c04d75e8/mulipikudimivegujagos.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd627312d---kinarimid.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b23812c36---xabosexituropulidupema.pdfIn PDF document text
    • http://effektfilm.de/files/file/jefiwulopu.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/24855923690.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_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001077b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 17072 bytes
SHA-256: 2693640295ad80f593d56608e348750ac1d30e2f78f2cf7fa5a9a4afc08b324f
font_02_sfnt_off0001343d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343D 10408 bytes
SHA-256: 6a85e7a2a03441b8e88d98b5629dac7cffe5e1fce5295972c42dca432886654d

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