Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf984e54f1d12f09…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 16:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5351bb9c9a3ceb8d468abc79d31a540 SHA-1: b86a5c39e2a41f862681f104175aedc1acfac075 SHA-256: cf984e54f1d12f097c2e30aa301a7a1321742fa4702fe4562cd0377338abd39e
184 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains embedded JavaScript and presents a link farm pointing to various URLs, some hosted on compromised CMS platforms, designed to lure users into downloading further malicious content. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code, aligning with common PDF-based malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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.
  • 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://gocchame.vn/app/webroot/img/uploads/files/lejipegupugijen.pdf In PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/guzaleduvesasovofuf.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/runarudizojuzasanisaji.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/30873172416.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091812143742.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/45488367978.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/nuzerewipipunodawivuvugu.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/98acfb3cbd5084ba1627a158c51bf4d4/sonetapiven.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/libajazupakimiserevulumaw.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/donegewopozofadimejirutu.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/48257832362.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/34572318212.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328f7017037---zutegurovewiromubebipod.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/moxolosazunon.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/22430296037.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/bumaleridomeg.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161319de2168f9---zalinajanopuru.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/33380557125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cara+mendapatkan+uang+dengan+hp+androidPDF 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_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 16596 bytes
SHA-256: c2856c3c38947b96061348d4f01624c289b6fa95146fae7d6ec4b66f7af8e7b6
font_01_sfnt_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 10848 bytes
SHA-256: d21a0ef31504b15427fd4a4b7049a41af4b5253b1fc60010a57dd4fcb87068ec

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