Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c3c54812a6a14d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-10 06:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a841c62b70f581c98670724db538f432 SHA-1: c6040a99534dc33c60fc1015aceacaca5b528cc2 SHA-256: f5c3c54812a6a14d18f9f682e30daeb849a998eb5fa18e16e32b8dd55fc99269
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports the conclusion that this document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cochemical.com/upload/files/65708017178.pdf In PDF document text
    • http://hitplus.eu/userfiles/file/88819348207.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/2879407281.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/91974965304.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/88389852902.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/fuzuvugewopivage.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/10759876414.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/93966856349.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/jamipevovelaberesafuxi.pdfIn PDF document text
    • http://netart.hu/userfiles/file/vemojawenebipexalimejeg.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/vamobakow.pdfIn PDF document text
    • http://4yoga.by/pics/files/jatufepagawix.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/guzijibewasadi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c27f875c8---47163421960.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f14f16c46---bofowo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9cf67ad8---22720871033.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/61091778061.pdfIn PDF document text
    • http://didula.ru/img/file/23194901348.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/moson.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/fotifusulororod.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/tododagituwafeduxusaduzi.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d07fdbd5ccc29da35d71f38ae2a9d106/neruvogixemavilenabore.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/66120880484.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/65042664274.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-03/images/files/22549411204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=nintendo+ds+roms+emuparadisePDF 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_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 17412 bytes
SHA-256: a086fa4abf3be8e08befd1732c906a99b67d245e7ec486e5ae2a5f7e8d2e95c5
font_01_sfnt_off00011632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11632 10584 bytes
SHA-256: 9e7bdb574e99af177cbad85a578470d1b33406ca083f03de0035f8581a9deb79
font_02_sfnt_off00012e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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