Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d036351674e27e…

MALICIOUS

PDF

89.1 KB Created: 2021-09-23 15:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5479a9b92461e3da681d07fc81266507 SHA-1: 5e7823f95fce9cb06cddabacf6dcc3453cdc838e SHA-256: c5d036351674e27e90e5a56edb5d7d18fd45d1e44b6ef8ac83cf65aff03a841e
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 designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=pokemon+soulsilver+full+walkthrough PDF link annotation
    • http://tipsclubcr.com/campannas/file/91179363546.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/91573888287.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/s11dbjv8u6mcei184rjah76587/mufowaxegus.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/xuvap.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/24216122799.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca2b3961b5---kokuvapame.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147acf2d00cd---wosulutibokewij.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/falulezuxusuwuxazeza.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/wekusavolexabu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f94b7402e---zabafikomuja.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/turefu.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/42192440499.pdfIn PDF document text
    • http://chromoink.com/updates/file/35670259713.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/22513781415.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/71892959655.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462b76cd8a1---82194913435.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/23451555608.pdfIn PDF document text
    • https://go2germany.ru/files/file/47108909747.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/91155449409.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/lujolebokitomo.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/18135413001.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/18922986031.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/1737870491.pdfIn PDF document text
    • https://strechybenesov.cz/content/nabodugusugakodopilevisaz.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_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 19584 bytes
SHA-256: da75e693e2f964d8a608181cb820f970c4f4e6f7304899f5be5aa18d20b1cbd7
font_01_sfnt_off0001251d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D34 11008 bytes
SHA-256: 891976ad51892f99bbcccf85b752b78761707e903a0b930d3ee3a59cffaa5ba0

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