Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f5da7822c673ac…

MALICIOUS

PDF

71.6 KB Created: 2021-09-30 17:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 32d397302ebb5a591ac4aa3ac5ec8866 SHA-1: c1694035da12be85adf81bf69a721dd1dd8a0995 SHA-256: c0f5da7822c673ace2f3cfecd2756ada85e97511d35780616e49938840591d79
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic points towards an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://farmacieitaliane.com/documenti/file/vanoxobemuxufe.pdf In PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/20111771274.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/luparibopezazolofukuj.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/xusumobidazimazot.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/vonagodesevib.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613873c38890f---jebexoriwo.pdfIn PDF document text
    • http://thepvunamduong.com/media/ftp/file/sijusazosematufup.pdfIn PDF document text
    • https://chimrodistribution.ro/poze_diverse/file/luxal.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155633de2584---89563454358.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/44770542225.pdfIn PDF document text
    • https://bachson.net/upload/file/bugefexilelukow.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/gokipovagamaxujavaj.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/fuwufad.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/91427114380.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/76757638397.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/9071271687.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/teluma.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/11398769759.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/bizabeboj.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a427f8f692---67815936166.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/lotosokidusujivebujuro.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/gogov.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/30681531250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=source+code+webview+android+studioPDF 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_off0000b1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C3 17644 bytes
SHA-256: 6d9cb7c175fa6da4d91f8b9dfb152f3c79087ea30d5b57b6af39a3b95cf04e4a
font_01_sfnt_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 10784 bytes
SHA-256: abab893480226f8ef76d70fa7ee8af2187e0a2fd4d497b4026bfecf2e25e84ed
font_02_sfnt_off0000f871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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