Malicious PDF — malware analysis report

Static analysis result for SHA-256 6345355b05402268…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 09:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e21739501844eea863415bb3a6b5e86 SHA-1: 2aaf19482ab336eef85cc7c8941c91475bbf1b51 SHA-256: 6345355b054022681b4500ee5966c1f5f108d05c11eedb8c77ec525700a6fa78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The document contains numerous links, many pointing to compromised CMS upload storage, suggesting it functions as a link farm to distribute malicious content. The presence of invoice-related language further supports a phishing lure to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://drafthe.ru/uplcv?utm_term=isms+checklist+pdf PDF link annotation
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/628aed95539de46e8473b9c7c2be7cca/17660794040.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8c2950e75e---63632807512.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/21468045296.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/xagapomatulotimuvox.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/71e7048802c5182c5abe5249ad2ebfb2/81013546915.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/55178180159.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea1a3367cb---39516937149.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/35306351259.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/9236629443.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2735a8c31c---vojotitezejunitapu.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/fb0b9df9c43cc37842949a27f310a9e7/65912095926.pdfIn PDF document text
    • https://petala.gr/userfiles/file/86967760337.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/55798649523.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7ca19b5f---juzukiropapumikunobovo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1ede187dc19100b53661d0b5f5a09444/lobolekedusetutekemu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/palilagegax.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160debbb69720e---92005453441.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/75548659725.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/94852766104.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/68274503633.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jotalitabe.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/60631105702.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_off0000d1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 18332 bytes
SHA-256: 0cc4b8942166ac2b27370a8c8e21a86a2f3a29ca2edcb275fc05ee18ae296fb6
font_02_sfnt_off000118ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 10440 bytes
SHA-256: 5b1d0d1280283ef39693f3bb3694f9e806044e2653db3a6764e500b79d1d40ac

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