Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c9a0712727d6f8…

MALICIOUS

PDF

92.4 KB Created: 2021-09-17 20:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 131fd840fea2c8812d5a9c410f4634a4 SHA-1: 83db8dfbfe03b592fd02521c053395cd470e4132 SHA-256: c0c9a0712727d6f889642e669ec7b28290f6ae2870704fd650c73084c16334cc
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 9

  • 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
  • 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://synerhu.ru/uplcv?utm_term=out+of+milk+apk PDF link annotation
    • https://kirbas.com/img/uploaded/file/sazitof.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/6733948085.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c0e27fe3---duvegomet.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/tananadatatot.pdfIn PDF document text
    • http://abbaorphancare.org/survey/userfiles/files/68841672924.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/rageneraluxixetiwek.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/86707155799.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/88554940879.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/busugijamaxadir.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/vezepafogazo.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/4q163ori44lga7vo9niv9o41i3/43830593668.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/fupefugibizoke.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f211cba457---kekefudikukodibaxofe.pdfIn PDF document text
    • http://teifsepahan.com/files/file/6728558471.pdfIn PDF document text
    • http://signauction.net/userfiles/file/remajow.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84337259072.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/fabogopika.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614409b242554---42916251868.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/51106683916.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/tupukepogorofutiliwixika.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/44555333643.pdfIn PDF document text
    • http://brenderup.ro/mm/file/31026775448.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/18736673249.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_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A83 19136 bytes
SHA-256: 24c1393baaaf8b9b3dad4c43863bf8a239ab50cb34381af8869cd447357297f2
font_02_sfnt_off00014d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D20 10232 bytes
SHA-256: 99e45d380392b52005f1d738b99da332430c1e5b3ec376e9255af48df95cecb3

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