Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5103c91d27c730…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 09:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a5cf68d350d081f37bcf3e890a92c35 SHA-1: 8f188353a27b0a62018598e9a105016cff0a0821 SHA-256: 6e5103c91d27c730ace0661a7a913aa3f2d68bb7b337d0c13537bca9f7ed8b73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm on disposable hosting. The presence of external URI heuristics and the sheer volume of suspicious URLs suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure and heuristics strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=dualtron+user+manual PDF link annotation
    • http://abnicum.ru/files/file/tumetezabufajope.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/rufenilipanakuwuberidag.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/24028171836.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6d779a711032b0f864aaa694f27579d6/57102880501.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/39577158600.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210726190854.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/64223228974.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/wefojeposomezomoki.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/12249856793.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/76542712165.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/20352713383.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e4536dcd0---pagijemexipepo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16116679b94b7f---rezixoxonalor.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160eca9a783435---fekezevamewobixegise.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/wepubak.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/41440662756.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/108dbbaf2472787f49bf567c83feea94/4900948546.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/sojitujitexatodaro.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/81168346845.pdfIn PDF document text
    • http://keitbg.com/images/files/supagafunigezowoforefado.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/90031412410.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/703678390d2fc8a3e27f3cdcbc8d1eb7/povemamefokazukililo.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/bgid58tl242s06op6clrkocim7/wegujezuza.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9448afc69---33710750411.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/77991390577.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_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 10276 bytes
SHA-256: 22fb08b39365cbcc5657570d1c9bafd30a7c170cc9a9e5ee863eb86ecdcb4aba
font_02_sfnt_off00011a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A69 18136 bytes
SHA-256: 2c728fc4136b98d57c4095ee4c33593acf70fed329216aaf6ebf8508a6509e05

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