Malicious PDF — malware analysis report

Static analysis result for SHA-256 75743c7b412e674f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 03:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 26aba6e3a2b62cffbb4314e2505a77b6 SHA-1: 740d66a06073e2fe86e6854138c5b012aa21478f SHA-256: 75743c7b412e674f0346879c0502e940e0faed2d90095a9900eb9b43404fcde5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. This structure is indicative of a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://accessprecision.com/userfiles/file/68229610589.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f779d0b25f2---41624429132.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/76714248112.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/45126645371.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/97238446216.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/zumidedubefisegamefoz.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/jugakudinivu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3658380eb4---13387643027.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/96669955508.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b3b0a9fcc1---jarisa.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607102f22642d---40290136425.pdfIn PDF document text
    • http://lagrupacio.cat/file/98350152740.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/saroxek.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/97100465439.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/85351698627.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941eee613d0---89655872513.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609c078c2e745---45250274774.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/78391158924.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/pajokorevu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070eab2280af---98344712321.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c858106090a---pemaxevex.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a40614abd3b---79727528758.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b20f72700---46911391618.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/zorarozelojan.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/dasevazovuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=narcoticos+anonimos+libro+azul+pdfPDF 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_off0000d2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 10924 bytes
SHA-256: 5b2540f64c7b2102036acfe507e1036ddacc1b641614a1c5ba9bb034c8badab9
font_02_sfnt_off00010406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 18500 bytes
SHA-256: 428009e2f3f4e3bcd893433121655fc601688c05f0e8746e978cd1df0dc1e5d0

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