Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c8670e2bd97302…

MALICIOUS

PDF

74.4 KB Created: 2021-06-15 22:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 060e78ecdc8010c578fed2ec14fe2080 SHA-1: f03ac6dfddb286f91f91f4c1e66bfc9a1c577b2f SHA-256: f9c8670e2bd973024d5c2cc569b6ac1d7793612fe63c8a369a3cbf93b36c6f92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=nalin+varma+hanuman+chalisa+new PDF link annotation
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/pmfqdqvqr45kmj3tobnm70o5c5/18952947751.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/08403dc01e7572f25e92f301b98a662f/bovaguja.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/50580380336.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/dafd51bd1929411ea5617cae65ca3f00/lokefudugodoninizuz.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c922de9bd---25894708012.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607071a032c91---61547673681.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/50c5e07f10b50645c31edbef293bf8a4/mutako.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/4ced3672f6731f52b4523b832c57ced2/fojupukogigu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d24cc0db2b---65984234314.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/t84bifb2qgv05sbhikfau2utao/85886166743.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802e11d1c52---palubizusoxu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/664730210344e0fa7d072477a50d1e80/36191231885.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/252c67ad17c1971be99fa300d0e94c88/zejusirelaren.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/81979124079.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/90381087419.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160baba894596b---78011898730.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/mogosomajipodexigobafuluz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66E 5160 bytes
SHA-256: 0bd685e1b6f4df872a061de2e8a0d1cb175ef93d6622cdde3863f683155626bd
font_01_sfnt_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 11092 bytes
SHA-256: 90123e7bfea2c7b2b669eb443fd3b82798bb55aa59ba5bce26c3f6751362fe1f
font_02_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 3856 bytes
SHA-256: ecf743e8d8d65a2a25a8e4fcd7487d0a19a067abb9e6fedca01d685a62fde912

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