Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9de7b2eb581bc1…

MALICIOUS

PDF

90.0 KB Created: 2021-08-15 10:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 20b6cf9413e1809a41312ae88ed83b35 SHA-1: 3f0b0ddb9072b9232db200ac7bf16f84f707710c SHA-256: ed9de7b2eb581bc18d29bc6e0312be24491fd4bd0a46606aa60d31b649925868
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick the user into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the presence of numerous embedded URLs, many pointing to compromised CMS uploads, suggests a phishing or redirection attempt. The document's primary purpose appears to be social engineering users into initiating contact with the attacker.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086515a51ca2---17381957752.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nodqqf6d8adse8vh49a2bukfh0/90787088496.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/50309741924.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/jivapajopo.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3a2593f589158e2dda0aa27064eb5ada/lugodokawuvibo.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/jireni.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5978980ef7---jiwusuzibosimevesanepuv.pdfIn PDF document text
    • https://sealskinz.ru/files/file/18172914915.pdfIn PDF document text
    • http://inercial.es/uploads/files/saxusefuzodonenes.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/93387793756.pdfIn PDF document text
    • http://proxima-design.cz/files/file/3290677268.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/79164741298.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608072ad86188---mimaguxi.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202108141457296370.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/9588953497.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a42f58f55---47943298357.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/logife.pdfIn PDF document text
    • https://mnlex.it/file/kekuvo.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c523d58a8---27230684972.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609276aa04d3e---58714538028.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f03d9f587---78690193559.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/kasigoxuledukozesekepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=premiere+cc+2020+system+requirementsPDF 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_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 17404 bytes
SHA-256: 96de9e32b91f7d4fd57d05c5507fe26915caef673b8fec8a9a2293ec7f3f08bc
font_02_sfnt_off0001419d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419D 10668 bytes
SHA-256: 9e821c0911186bdb37e1c36e14556192005e45b9740303339cb6f541566586f9

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