Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd6a9f089e288ba…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 05:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 37843886447eddee00ef72a5d0eac265 SHA-1: 21f4701a1fe58cd8d13e58b8ee16ab30a0d87cb5 SHA-256: 2dd6a9f089e288baabc6a7fe65298eb4442a6f8c02063846bfdb0424a4842fff
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan. It functions as a link farm, containing numerous embedded URLs pointing to potentially compromised or disposable hosting sites, likely intended to lure users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to redirect users for phishing or malware delivery.

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 http://cecev.com/stockages/files/rurabudupisopakix.pdf In PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490a33d2506---navogoderole.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/38287271215.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/xibuzorarefesovekuxoduram.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/jukubosegejasowa.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d81242829c242f34dea50b17be21d6e5/5826175383.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149651c357dc---juguson.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/rameliwunujokogutalu.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/58950077934.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210919_90E148BCBC4D7AFC.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/mozikewolenodeder.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/69100770813.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/39324427160.pdfIn PDF document text
    • http://lejonhund.com/upload/71695912587.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494698d08ae---wuxel.pdfIn PDF document text
    • https://kildevangen.dk/files/sakumerodulit.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109070346271329.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/da544lb5h8dhep6bjf790gcnu4/37883253542.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/vomikinefa.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/pakogarunedol.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/37491122302.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/60265599313.pdfIn PDF document text
    • http://ametansk.ru/uploads2/49535796893.pdfIn PDF document text
    • https://ccskin.com/geektic/files/bexivisuxivotinenimus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+restore+app+drawer+icon+on+androidPDF 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_off0000b63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63D 17356 bytes
SHA-256: bf23e467b94012af9f1aa90f7a1c33f3a2edcea3635b656dbbf37c6ebd6a90fd
font_01_sfnt_off0000e2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 10536 bytes
SHA-256: ba9b6e35c749b857f1cc02a465ddca8d24c9737fe0bab650fb507a423532140c