Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d672cfee2d627e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-02 16:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb415ef2a06fcb2d9789d7cb7acb713b SHA-1: 5f62dd6dea62f5f4942fbcb90c7fd4587ca84e68 SHA-256: 18d672cfee2d627e8cefb3463ebc3d7251c0c026f816ab2af17b016c4e0e5a9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a malicious document intended to lead users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=remembering+the+kanji+1+pdf PDF link annotation
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/df0442194f6bcc0d3d3d9ab8ccd949c1/gatirelesotunerigo.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/25184029710.pdfIn PDF document text
    • http://vejwun.cz/images/9486724139.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160add320228e9---nedasepomatojezizezarun.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/83952807070.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a34b3b82bf4d157300c3bc7788183215/runodesamabonofa.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/16294436991.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/lajovanixamapadow.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/10240012385.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/95735979369.pdfIn PDF document text
    • http://fivesteps.pl/userfiles/file/15174092683.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086758a332c4---fozowifoxitamu.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/49397857844.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/gopenotefiziw.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16111d95d234bd---38318935828.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd608ad1e---rakolonejitirasuwojigid.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/27926489629.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14eaedff7d---digar.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/21609739288.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cee89dd72e---73139738674.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/bisixejurisakuviri.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f3b86254---17349156507.pdfIn PDF document text
    • https://phunhai.net/upload/files/tipupekutu.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_off0000b43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4E 17896 bytes
SHA-256: 120ff3382f7d7176f5c3625b636dce5b43dea7537064315e3f22d550b9ac749d
font_02_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 11068 bytes
SHA-256: 9b656e3abcf8de95cfcee4b794608cab10facca71b34fe372aff3d3eefb39289

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