Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d21c2f15c6002e…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 09:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 73fe14f2ea483845bc63b336d44fa88f SHA-1: 150ab6e935ac08511380d995ceb25d66d14ad241 SHA-256: c9d21c2f15c6002e692c09d05b61c78eafd98560dc9257af62aefa00dc422b57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=andy+dufresne+character+analysis PDF link annotation
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc58ed4ca81---nazowe.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/gewinel.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/kojavafelezabenu.pdfIn PDF document text
    • http://alvitraders.com/files/54296269476.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/90520176854.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/7162734593.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608256b84197d---ruzej.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/depozifuromijimusofawu.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/53936777676.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098493f16d6b---wiwamuv.pdfIn PDF document text
    • http://whatdwellswithin.com/file/xivepofegotumulubejejilu.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/gd9q0gcau4vl7cmtskprsl3tv5/gugibufidesijidabe.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0066179e62510e49b77554cb9f032180/72832737914.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/vepibugekikitid.pdfIn PDF document text
    • https://kede.org/userfiles/file/depejanidunimezeligemi.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/e9d326f15ab0bd6da776cd14f257e775/34544776066.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbadfbdb8c7---nogukuxuzateroperi.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210726_0D65AC935C7CF913.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/39606399625.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/jomababaxodef.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/47348434532.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/fekepojipon.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076372adac60---38873579610.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f8de25e2fdb4ad11f224f757dc2930f8/62640450390.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bb4992bf7---duwesivosawaja.pdfIn 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://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_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 10648 bytes
SHA-256: 7fe2c8c82bcd6cafa5d0a7db4fb980b63a8fcc3be28f5c33e5003c0cc46433dd
font_01_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 19752 bytes
SHA-256: e93549938bd76cebf8226909b87ed31f955ad5c5b6ce744daf606339262014e7
font_02_sfnt_off00013155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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