Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f5e210306da82a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 05:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7eb93463878de9be566a7256f6ea97a9 SHA-1: 0fcb8286f2d4527566b3b6d65513d6d717591383 SHA-256: 20f5e210306da82af62ad920de724073557727b3b5b8db455ad5b5ce2f925077
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=units+for+thermal+resistance PDF link annotation
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/25089231648.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/zasifed.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/79785f8ebd3621fc9d65b4bbfd4ba72f/82856995134.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210609_8F88458CE30EAB48.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/95145519427.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610abbed443d3---gupasebofoluwezabimija.pdfIn PDF document text
    • http://sns.hu/_user/file/zezusigolu.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/judijedonusifi.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/80114011312.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/1400368027.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/18033356751.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/ziragupero.pdfIn PDF document text
    • http://altinay-law.com/images/file/44429426139.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/95701097278.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/marejivodoje.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/niredowufigug.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/71077450977.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/56050772765.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/39468625983.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/mawibudimakimidavud.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/redapuvilefafapig.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/kimirimijofefok.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/vasarinirekorizolaxaw.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210706_80DFB693A4F0F17C.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd1c306d6f---vovowamepok.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAE 17692 bytes
SHA-256: 899eaadd90c063e4a2267939f90ca767a81e5fceb09ebab195d32f15685b1fbc
font_01_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 10608 bytes
SHA-256: 3fcb1f1bba8e1a0abe3881ff19ca4e085cfdacdc07e4c6a89664ddc5fb6682e8
font_02_sfnt_off000115ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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