Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2bf7984294098f…

MALICIOUS

PDF

90.5 KB Created: 2021-09-13 05:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35d3129c90b96ff67822d3128b46ac5a SHA-1: 2996add4e591adb47e7652b5c64db571aa9839f6 SHA-256: ab2bf7984294098fc932b97ecc34ad6116c190dfe0fbd66b06671b8c5e618a7e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tspinstruments.com/cache/fck_files/file/zagatiw.pdf In PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/6f361b1d9f77c40b9509d576fa338613/zitupise.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/wawasuwug.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/48882509531.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109040021579322.pdfIn PDF document text
    • https://coevent.ru/upload/files/pufofekalovavojevit.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c29800598d---pogaj.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0d7b91ea9---42642422012.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210907164423.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/13183242105.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/43121081110.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/doxexitigikutivizojaka.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/43804321194.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3df3ab041079d187884e24e15437bf26/mesaliponogilamuwu.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/kopimivevab.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/20290382944.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc0d7723b74a32ad6022be0c71226439/wegufizatonofuzaweva.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/mogixader.pdfIn PDF document text
    • http://c-six.it/userfiles/files/13479211402.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161355fbb53904---27062660394.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161344d4611850---rasewolele.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/81770194433.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/60918185825.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109130516594330.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210901155240_MjU4OTMyNTM3NDk=.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8e4408af2---54209929629.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c1c61130---nedimuripaxawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+watch+the+joker+for+freePDF link annotation
    • 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_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 10324 bytes
SHA-256: 091855087d1e72b3b7c901dfc5c31a5463440781987395e97ba3a8148537c846
font_01_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 17748 bytes
SHA-256: bd0353c3b6e5ae5fbd3823ce184a1b7ce547467016b0570227eb4160f9458bf0
font_02_sfnt_off000143d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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