Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f8661a7603c0e5…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 06:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4968a71fe655a02cc1ffa7325d6289fc SHA-1: 7e3531c19db09fe356073d5bb56c4ff64e6292ca SHA-256: 88f8661a7603c0e580c78c2f358d375aecb77fd1d23ea8746bb17b08f07a795c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lead users to malicious sites, potentially via embedded JavaScript or other PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=wwe+2k+game+download+for+android+file PDF link annotation
    • http://espokebar.com/uploads/files/sivasezoxokikudubiropop.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/janopatibep.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/xijiwanumizojutasejidu.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7db0ddd20d379ab2de395ea6471a8586/65406561243.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/dasavijurowisadinuf.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613696ea09cb4---difisijizibira.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210915_223232.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/mivakazovawozusujobad.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161391b04836fc---derapo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161302d7bcd474---41484212367.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/17883202276.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/supipofopivafonerepagute.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/71000878114.pdfIn PDF document text
    • http://gazetavk.ru/img/file/87519416380.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/33781285426.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/sonutodotevijavidexojus.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/ranojovimuvodinonur.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161404ac9bf6a5---2127218208.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/visumekegeker.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d457bd1ec7dbb63872cb8d494ea89a02/52087348267.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ead0672f7e---10156722744.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109071845358947.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/50722544604.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/39277319803.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/fasijukidobiba.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_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 17612 bytes
SHA-256: e8e518195ace5a16f4d482646aa3f49a355db3466380378312d8239f68b50039
font_01_sfnt_off00011566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11566 10720 bytes
SHA-256: 7e2bf285f9617ecddeb277252982e1e4bb2c1668ae1322b52652a9a0ca0a71a8
font_02_sfnt_off00012dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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