Malicious PDF — malware analysis report

Static analysis result for SHA-256 430b0eae295e6cd9…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 04:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 02161ab9a130369995583cbe94aebcc5 SHA-1: 4f97fc0a7979321a6153ab6518d77db4a435e231 SHA-256: 430b0eae295e6cd954d8ddad1362e4850e3a05cbc8b9d37c4d5da5d88634cdd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://silver.jo/ckfinder/blanc/files/nowemewifisufozomokovu.pdf In PDF document text
    • http://donauwell.at/userfiles/file/zajukamerozapejid.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/73186292334.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/0e06f3379cecac6d1355d670c6437066/vokonapozupijekulipet.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/jopegizedagipirati.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/timejokituvuk.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/nawedejulixo.pdfIn PDF document text
    • http://jarosi.hu/files/file/jekupemuxukalukif.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/9837218524.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/ruwufoter.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/c022ac61338e3d5d282117705f1a9510/bizixokowixazit.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/47037617946.pdfIn PDF document text
    • http://hevolta.com/upload/file/tikabexisedudurisutajo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962813ca5c3---37868586892.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/16532723772.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/58545785457.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4948eb6e2b---xutivodarodin.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/vhbpmo8dim38qumv6mlf32slp0/63681694146.pdfIn PDF document text
    • https://triosms.com/userfiles/file/85027719222.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/kalakulodovizorakavubin.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160832afb212f1---13202871950.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/39954564784.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/bimezevuvuloleka.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/93329672361.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/sufoxev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ak+jain+physiology+pdf+onlinePDF 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_off0000bc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A7 10896 bytes
SHA-256: 48b89692b068ef314b69158f4846ecd2852a5d2b9b48e1bf82bcedd550f9f4e8
font_02_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 16440 bytes
SHA-256: 7d7211db2c68ed44d20c7e0f57895fbfffa70a3790d2b8dfcdc9e1fce9b7cac5

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