Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdacce70d4fc4e5…

MALICIOUS

PDF

86.5 KB Created: 2021-09-16 17:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b3a811020815ebe50198c772be853d83 SHA-1: 9a49a43001bb4e1edaf64f62073a9eb0a1e45a4e SHA-256: ffdacce70d4fc4e52fe0bbe7c253bdaacdb82cc48ecc49dfa1dad46972e64724
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://drafthe.ru/uplcv?utm_term=system+ui+android+app PDF link annotation
    • https://vibingvibes.com/userfiles/files/wokirojodonaniwir.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/gulowikemirewaxo.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/67396893971.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/xofosuzo.pdfIn PDF document text
    • http://carszana.com/image/upload/File/pukiw.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614267c2bfc73---rarasojofapejanul.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109031044486156.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/rexolozidutexeza.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/11315193608.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/labazubawopi.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/60924830528.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/xotonimesu.pdfIn PDF document text
    • http://misbahelmudii.org/ckfinder/userfiles/files/29968250218.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/96911461000.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4c0f484c4---fumonazagikoxidosisekobuw.pdfIn PDF document text
    • http://sswjeans.com/files/55125736858.pdfIn PDF document text
    • http://surtek.biz/image/files/20150326_031826.pdfIn PDF document text
    • http://indexone.ru/upload/file/lowiputuwozudoxokevikom.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9114ad92e5bf86e70ebe6b8aaff0bd2c/gutevidalifukomipot.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/81206600458.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/rijuvuwujo.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/zevowajisumiw.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/42041312999.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/28889437424.pdfIn PDF document text
    • http://fitviewer.info/files/file/98917429968.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139c7041b59d---bobexaguxulidopapanuwu.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/20717324219.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/49630540596.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_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 17388 bytes
SHA-256: c848aabb624821605df24275db2a086a1a77ee773d9a5eae6766beb84cd4a762
font_01_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13352 10796 bytes
SHA-256: 5d3b30a756902a10303ba08a67df9d20c1a007eb78c4ffbab0489b7045f97f17

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