Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef959528e42d563…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 11:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 99c0af21fdde138d2c18dec2a8b275a7 SHA-1: 3cf3b68f95edbc7b896554f22d14d61bc3445f9e SHA-256: 7ef959528e42d563b931c07037f338eb968c18e01583846a02058e4b94bab0b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wonikquartz.com/upload/editor/file/1628647948.pdf In PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/6721a9f3f589bae943746c60446b00ab/xotak.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/41465150408.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/rejazinawipixola.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/10841572324.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/96e03d454de7b8ea7bc0271ccf1b07c0/31681108012.pdfIn PDF document text
    • https://digireg.nu/upload/kavudal.pdfIn PDF document text
    • http://web68s.com/upload/files/nesenutidujazonot.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/gemonekibufirelopiwilat.pdfIn PDF document text
    • https://koratspring.com/upload/file/jirawizunolekaninakovi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161001b581e427---17075433982.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/zolepogijila.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092f83a2bee7---98396389810.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210714_150921.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/21458000744.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0b0b69cd97508af41cc239cc163c51d8/70886207834.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff4be925f3---61731636638.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/82d0ohh1ud421q3kdveh19iuq0/mujutagigimexepog.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/94823670691.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e56770cf7b---xazosoxo.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/dolovatova.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/56a0c2b38e3916a9d9ae27deb3dbf6ff/xarujamosejibezodonibise.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/oquiv36splds9gqfgbg6bp9cgl/medifufejinez.pdfIn PDF document text
    • https://istanajp2.com/contents/files/taberonem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=syndicate+bank+dd+form+pdf+downloadPDF 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_off0000e042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 18764 bytes
SHA-256: 7ada9b5f26e0686770d21ce78920d1b63199f6f8dcdd4546e21ee486eefce70a
font_02_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 11120 bytes
SHA-256: 4ca696af8101e3a7072d9ebe51ff2e9a839b95dc286a4a7353c2e33c73a93491

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