Malicious PDF — malware analysis report

Static analysis result for SHA-256 9013667aae48d831…

MALICIOUS

PDF

75.4 KB Created: 2021-09-08 13:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c1438ed9dd0d8e2e0bd1a39cb0e9e91 SHA-1: 403a9c22f8ecbb5c100d2dd45014d19997ed65bc SHA-256: 9013667aae48d831df95423a5f00cf60cc3f3c96c7494010dbbf1809943772cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, many of which point to compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to potentially malicious or phishing websites, indicated by the 'link farm' and 'phishing' heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/kefexogumegenovevuke.pdf In PDF document text
    • https://audreyheselmans.com/_files/file/jasatok.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ccd4abe89de0d0fc3b5033cc80a0ab98/zoxegi.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/jesobutof.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/84055045303.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/kajevalenekapisixizo.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/vaxixomagitazujipe.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/63145792195.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210908031653.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161380ceb3e99f---jodomanevoletisegotakaguz.pdfIn PDF document text
    • http://art-ball.net/files/file/marifanumuxezivawe.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/feo3e6vi7cbkproeidf9a90o70/zijogoxuvofofo.pdfIn PDF document text
    • https://limadelimon.com/images/file/jinebizonibowapameri.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/pakorirawokoxefuv.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/lesenoroxanogiki.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/65281366193.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/91911032101.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/41601143764.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/87999152084.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/44235984988.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f580ab567e7a3ea6daf361181b5d0f5f/71300001610.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/30118278149.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/57873139354.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/fejojetejituloveso.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/tofedawepasejanibokuz.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/pupekuput.pdfIn PDF document text
    • http://schokozentrale.de/idata/tutuborarozamug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=call+center+job+description+pdfPDF 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_off0000c30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 10916 bytes
SHA-256: fe9eb7e5d0847b575819b258df32d4cf9c7675902d70aec9c019ecb317c89dd0
font_02_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 16724 bytes
SHA-256: b47a4c7dc39d1312c4100c3ee2fd07a686e2d30bcf84bbba1554b5ae5935fe84

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