Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a23d89761fa430…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 02:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 232d528a29d9f0eaa16f51dc457f7d4e SHA-1: ee940620ecc969f9154a2e7f92d4542b72b2dce4 SHA-256: 25a23d89761fa430f2713b370242ffff842cf8ec746cdb1caacf24175527a3bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or SEO manipulation scheme. ClamAV detection and ML classification confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful content.

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 https://ketchas.ru/uplcv?utm_term=honda+accord+2010+owners+manual
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608256cc9775f---41338139812.pdf
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/57598611220.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ocslu1fsahhb4nfto0p644ahk8/65914620048.pdf
    • https://peisheng.org/uploads/ckfiles/files/6135f844b6f94.pdf
    • https://avela.md/userfiles/file/19414946036.pdf
    • https://myparrotfood.com/user_files/files/wutoxugipupijevolox.pdf
    • https://macroedunet.com/userfiles/file/54471104276.pdf
    • http://kingbikeonline.com/images/upload/File/tapezegudozasiz.pdf
    • http://studiorumeo.it/userfiles/files/xofubituvivivamajajatux.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/38957186728.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160879cc116fe7---kupurugapes.pdf
    • http://touristclub.in/userfiles/file/vefolixaxediduxumuxeleti.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/jspqbc6cinvcb3bobgpbv1c2s5/gasomepetigexufe.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b1e1f75e---varorekuzukone.pdf
    • http://beijingxinzhi.com/userfiles/file/20210523012735_503720439.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5418ce624c---zasujoxavuxexab.pdf
    • http://wccflooring.com/userfiles/files/zuwuzuwavotapisodeziku.pdf
    • https://denizlihorozu.com/resimler/files/38804987907.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/e1bf1a83b957c700e76b229c329f1c33/44990422648.pdf
    • https://n-zvuk.ru/upload/file/dejifi.pdf
    • https://eliteplacementagency.com/uploads/files/43674723446.pdf
    • http://tbeaindia.com/userfiles/file/71307181339.pdf
    • http://beautydent.hu/editor_up/9894787670.pdf
    • http://unewstoday.com/task/userimages/file/bamizawajiwujegisewap.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc1.bin
60fc418897e1339315ce7abcc83086db8ee89dd62659e030bc28b70b800f9025
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 10812 bytes
font_01_sfnt_off0000f8d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 16792 bytes
font_02_sfnt_off000110e3.bin
d6fe62be7b4809d9badced2ac896646ad0efa2ba383918eebd4872bbba7433b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E3 17088 bytes