Malicious PDF — malware analysis report

Static analysis result for SHA-256 59355537983a314b…

MALICIOUS

PDF

95.6 KB Created: 2021-10-17 02:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9328b218ea01a806934022849c5ef467 SHA-1: 28eb62fffa6f4f246a044475e14f5c92d2715c36 SHA-256: 59355537983a314bf1e96f4228ae1e95800e5505396903531daede5bb3fd49d4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, likely to host further malicious content or redirect users to phishing sites. The use of disposable hosting and UTM parameters suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7156

Heuristics 5

  • 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
  • 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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7625e133c80932b6586ba0141b7bf5b7/74495193154.pdf In PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1615223819f9a5---43313074534.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/mugejisugomosiboriwuwiba.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/goporanaxeriletatuv.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161486e523ed78---bolilodisoletodedodezuna.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/didarul.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109081119185214.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/gamiveg.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/jesarapetuj.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8e3edfbc4---26838635534.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/pawubomawenosogepobubi.pdfIn PDF document text
    • http://landia-print.com/pdir/file/32896884789.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/nulamuvamiweviru.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/potawomuliti.pdfIn PDF document text
    • http://talleresjpg.es/img/file/82284051581.pdfIn PDF document text
    • http://yongqingtech.com/d/files/bokexomulajipuxelafonera.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/73044069967.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/48899628164.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/20258365471.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109200926207137.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/85819612405.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/936488127.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/12475092515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/cmwvf4RlXg4/uplcv?utm_term=asian+stink+beetlePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E94 20388 bytes
SHA-256: db4c47e503a9b203b8073fc120db330950a0036f1e28de54d6912ee68c8aa680

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