Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11613450cdb72a2…

MALICIOUS

PDF

89.6 KB Created: 2021-06-28 20:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 68c74bc55ddbbf9de74337058b4e97ca SHA-1: 2f2e6771870c237f50a7b013bb31ae08cd958487 SHA-256: f11613450cdb72a2113791ac1ff71277e9bc297b0f86625a00a515ad2673edcc
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download further content from compromised WordPress sites. Embedded JavaScript streams are present, suggesting an attempt to exploit vulnerabilities or execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 10

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a4e232ffd---14561702057.pdf In PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/32991114791.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/turudinukarapi.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/9918301073.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/26217627429.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3877902a3---8605935873.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/pitabatavabisa.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ff7d9f29---26511356874.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/80436912358.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cfe3a9453---kekoxutezapovi.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/nemumiralivelanefijevok.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/namubi.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a319b5c1caf---bipadusulevamuxejob.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/17874296105.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/mogag.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cc38cf7fc76---zejagu.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/tiforene.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077705a66d11---56723255150.pdfIn PDF document text
    • http://evola.it/userfiles/files/wozivawagefowexitidilozit.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/21g5lk18o1rqi23o38e730vhfs/93002389201.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/220271e2f691ec33b06334b9af182558/48282876257.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5a55b566e---ruxatama.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d9edb71618e5e861c521f3cb52befcb8/93872734620.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094d17ccc142---mefogunokanope.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/4689337504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=important+questions+and+answers+for+class+10+science+cbse+chapter+wise+pdfPDF 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_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 17360 bytes
SHA-256: 7bfb198958ea038dc9de54960b316386c9c0cbfd3d0d3b6bac347c4cfc5026d9
font_01_sfnt_off00012326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12326 11484 bytes
SHA-256: 9ecfca1916d09cd1ee0192c34d186eeebdaba2ab8287294561414148213f2dc5
font_02_sfnt_off00013dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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