Malicious PDF — malware analysis report

Static analysis result for SHA-256 746e7bc3f7cae5d4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 15:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d26c5017d7c206372f992d5f3b1c6a5d SHA-1: 1ab10824f3bf5b5e973f010ce10fed9aa23ac944 SHA-256: 746e7bc3f7cae5d459d3b95ff2d3ae53ada911f754a5cb789348ca0e8d27c532
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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 https://pistant.ru/uplcv?utm_term=kinds+of+sentences+according+to+structure+worksheets+with+answers PDF link annotation
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dba802efc22---lanunokopupekemi.pdfIn PDF document text
    • https://tadimtursu.com/image/files/nosomogebaxufituru.pdfIn PDF document text
    • http://24cvety.ru/upload/files/rudegovolesupiluxuv.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/bejilelajo.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/68946911731.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/wamufirodeju.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/ruwamanasazarujuxojexi.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/2af02lqj1df66g8fk50kujci3l/naniregefupagef.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/giteve.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160743446d10f0---lapadijariwitafare.pdfIn PDF document text
    • http://allasclub.com/campannas/file/gitugezifuxa.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/lne6tfmu6d94tvg62pphnpvje3/lisurusumuwinuw.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a721404780b---65450748401.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/89722421217.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/fedadug.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/weguvixaw.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/534fb19dc20e7b9fdd531077ecc5df88/94723701188.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/acecb66975c78d97cb88c4e69e73c3bd/95680639991.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vofezonezeti.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/lamijunozowenoteruvot.pdfIn PDF document text
    • https://agatanorek.com/files/file/84445999761.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a991324d4e4a02d1bb0ef7457912a60a/vizafejiwazoxozew.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/76046465337.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/34503047571.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607909db64bc0---86784369851.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_off0000da2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2F 10976 bytes
SHA-256: 393baf5713268e99a73309409b705046b2f85ac76bdd3e3c3d0dde57d3d9fd7b
font_01_sfnt_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 18492 bytes
SHA-256: 6836d6941bdb2f5caf99e852cfcbfc15d22837f9635084e077372b1df29e1138
font_02_sfnt_off00012365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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