Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf313d85a55aa7f5…

MALICIOUS

PDF

98.6 KB Created: 2021-08-23 11:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8e905185ea7cd7ef1d7b718cb520d1ad SHA-1: ee6bd3dd4f217fa2c790bae33497181a5f021671 SHA-256: bf313d85a55aa7f549a136605d2eae38967ba12f31436a02287c9fdb69fd96f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dacinsara.ro/fckfiles/file/64834483970.pdf In PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/kubusudab.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721faae5032---86468147065.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/wowoji.pdfIn PDF document text
    • http://ned.ru/uploads/files/bibowinuniradetidir.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/jifoku.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160988d892d9c3---47665327832.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/5f9ba261cc73d9b89879ce9718930b93/29203843058.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/86425433456.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/11647263261.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/r9qcaupk7k9c96renq1i6pnii1/39012481461.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/bepetofebuwunuwijetase.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/89554614004.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082102912544---53596151328.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/bc51095844e33ba295c764da1053d244/8032731243.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/dewokaworojenudakasatuv.pdfIn PDF document text
    • https://ladangmimpi2.com/contents//files/78466920653.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0it7f35molh5m0v1hc3mu5nrn5/xonesorogopamo.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/88c7e2b6281fcdea81c000f89421bb76/rizared.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/vsuoi3hq3j7q28pa7cmudjs1lp/9647633652.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/duvejuduluxalewuruzuwomut.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/wekuwalis.pdfIn PDF document text
    • http://checopharma.com/upload/files/89048452468.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7bcc5895f---60244311893.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210618_E94370A3D4F69BA0.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=weekly+food+time+table+templatePDF 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_off00011e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 17160 bytes
SHA-256: 6ea7b136ffd94ad95e9641f38473e60d6f6c860b5999a55626701f1ecec85195
font_01_sfnt_off00014b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16322 10628 bytes
SHA-256: c504d9b1095ca45fae2d1fdb42f76dba6ddbb58fb15b10d099dce4de633038e8

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