Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f9546494266c69…

MALICIOUS

PDF

62.2 KB Created: 2021-09-01 01:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b41a9dcedf1cc6a1aafcf9beb292f0a SHA-1: 97db9650e4fe9e888dd5a97e634fcd0f22317002 SHA-256: a9f9546494266c694d52fc05e59d2f8deafe9a90f392768cba4e9d4084ef88ff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is classified as malicious by ML models and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm indicates the document's primary purpose is to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9623

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=android+pdf+viewer+library+free PDF link annotation
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610450884a3ed---kapizumowazudivaw.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/kexulezixubukuru.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f351d868f---65461774096.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/84309903891.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/nupolijejasakelibudawisu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91943d0327---56247037692.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/t2ojsi0ka4onlikll13l3od8uq/1023641096.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/pudemimemodotev.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109010533274157.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/jofukowuxufojinugin.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/72510353660.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c43b88f337d---tizeretupen.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/60980023840.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/mivanunewo.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/20590654738.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094074ba3d54---39311677590.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/54333551790.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/86319587138.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/ririkugurinevigop.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/tuliduboragifabimitutada.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1C 10612 bytes
SHA-256: afa4fce3f0fb9a8febc81ee71c0b165df07b78a40fcd479b8d3c382d1047e610
font_01_sfnt_off0000d247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD247 16844 bytes
SHA-256: 8ec853250f74ee6badd064ad01a21d6d5e609cdb3c02bc4a6e5269cbf00b8add

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