Malicious PDF — malware analysis report

Static analysis result for SHA-256 c619694772486ced…

MALICIOUS

PDF

79.8 KB Created: 2021-09-12 21:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18ea43c13a76246605783ba3dda63e94 SHA-1: 7ff362374693320bf84af244a70e8aa63689f1bf SHA-256: c619694772486cedd33cc3028561f10cc8c7aee6309dcc1e89f63316c4407f91
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bselink.com/userfiles/file/82781844923.pdf In PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb7e4cecdf---79589203201.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/vigodojak.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8b2e4a151ecc687129ac21d3678e22d5/4682326869.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/fekedemopisezanun.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/zefifakajesotapitubafev.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a0eb5c79f---69402857785.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/27589029177.pdfIn PDF document text
    • http://teifsepahan.com/files/file/77008961729.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/9833858263.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/feed4a00e03d9381e3887f3c4a5b0c90/49702825126.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/mizilagupudubomab.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/sedojegarepid.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/8ea03a3c916ceabb0cdbf734c50eb4e9/27590825010.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/munitakur.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/5169671973.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/98230401187.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/kafekogirureba.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/81746022495.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/73801242539.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/23895386906.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/12315010025.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/dofitulidiwolulini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+does+green+and+purple+makePDF 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_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 17760 bytes
SHA-256: c37eba73c2f2b8c5797cb43976b5cba363c8a307f705e87d9ed1e08048448d6f
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 10932 bytes
SHA-256: 3f149c388e6171f4b2dbb3919237d4cfa0b999d68a639a208f5de14eeb0b17a7