Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae1c6252fac5408…

MALICIOUS

PDF

82.3 KB Created: 2021-06-10 19:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5b34d1f00b7ab59508356a8e4a46e27f SHA-1: 776550e5afffe05c80c7d699b0f8f36f543081ab SHA-256: aae1c6252fac5408c8780bb94cd55eaeb8ed7d9332b6844be5b3f4dffc63feb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and external links are indicative of exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=geiger+counter+measure PDF link annotation
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093df2b1586e---zumusalorelulabu.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3215c7bfc---zasivexopelozaxefuwifemiw.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/simazosomosukonapofe.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608564dd096d9---18723816812.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hm9jiqh1ml698p3psgqnksr29g/futawaja.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/3ld788gcedfj0v1h6cns48ho6q/97885581730.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e8650d8f0ed54173e3136ea0f62bcfbd/60749818370.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/62494114892.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2416c0c52---zawanodigik.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/lebig.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a4ab8567---96272460148.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/191591862060bf8b0e2254b.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cc24e2b79---kuxonojimagirexun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 5120 bytes
SHA-256: 6128cf351a1691462762133c843c4b5fd2bf5d7dce40bd31cdad54b318cedfb9
font_01_sfnt_off00011510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11510 12304 bytes
SHA-256: dfb5694a4d22ebb72162cf4626d794d9174d22754ac4dc83460308372d5d6941

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