Malicious PDF — malware analysis report

Static analysis result for SHA-256 164c2ffdd42f7d3a…

MALICIOUS

PDF

81.2 KB Created: 2021-08-27 09:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38e10f11965ffc3e347505f8370d3176 SHA-1: f6f3fcd3bdd85b3cddd7ef86505efe3e6adf42f1 SHA-256: 164c2ffdd42f7d3ab45cf4c8d7f42250715c2033e1357f6d21c6559dccdd016d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites, suggesting it functions as a link farm to distribute further malicious content or conduct phishing attacks. Although no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://inwebjor.ru/uplcv?utm_term=hay+day+tips+and+tricks+2020 PDF link annotation
    • http://geriatriccarenewjersey.com/userfiles/files/gufotejisinafadu.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/64420869826.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/96035330866.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/f38678f727084a84a4cfcaf1651c1b4a/farisu.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/62962881772.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/38209750665.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/27247611022.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bcddd829d14---dozefiwulofawesuniro.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4646b24901---lixogijojavofefatiwojen.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/fevoxodavupoxemiv.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161266fc9c23c1---57631817845.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/xojomezopikavumo.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/pajexu.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/wezinipafaxomuzajagepolew.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/tomuwedasudije.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210515082829.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/raneluriwarimemufi.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210809_4EBFCDD57097B7B4.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/jazum.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f0c02e6b1---55620840329.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1611d038136cbb---jogatoxudujogovo.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///tupuponawofalekip.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/83353471516.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/12955009281.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/79855940445.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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 16076 bytes
SHA-256: 205fca6229b5a5ddb2eaaf4e7cb5fa59d84f815c5c87979397dacd3f740a724e
font_01_sfnt_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 10648 bytes
SHA-256: f2464be5e48b68ef52ed4dc7689a3727b78a4ae51feeb5efab38172612d0bf32
font_02_sfnt_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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