Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae3a36df1b0364e…

MALICIOUS

PDF

86.7 KB Created: 2021-07-19 04:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 134f48389286fa490d9ffcde4d3fa959 SHA-1: ff0ed3df4cf42d6262e91b4811ca5f9d88cb964c SHA-256: aae3a36df1b0364ea0da1caf8a902cb9750f4e13eaed64d320c7b5a4bbebcf93
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tv-sat.cz/userfiles/file/93701236627.pdf In PDF document text
    • https://fonixkoncert.hu/upload/file/15618961812.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///19168632004.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/145649729f723dcdc834224a34695176/95926496266.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/49243486065.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/nudasevejisixapapu.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/24e60bc45fdea5a32e16c6833b9543ac/wasawivutulafomuxo.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/gukalorodivemuwivitof.pdfIn PDF document text
    • http://askort.pl/Upload/file/jasivusati.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/pidozilis.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f17849bbb12---95740458912.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/4466427248.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb25832304---mivalobijuriborurin.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210709_A651AFFC581550BE.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/7d9f0286aedf2006339d9b9d242ff086/3465018707.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/59837941252.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/sisakemiwezaniwiziwisodop.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/80108414457.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/jomanumolosubazobodalu.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/12506403642.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/pituxoje.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/48191850341.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3cc8968fb054412ee5deb19afa38e3a6/40664196509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+stochastic+settings+for+15+minute+chart+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_off0000e99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 11360 bytes
SHA-256: e03419536376e9894d76767e71b7ca33788722169e95465ce455596f04a74d9f
font_01_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 19064 bytes
SHA-256: 02fb2ac95471e4fa04afa893566dd97827fedb459f74a97b2dd683a990611b77