Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d524a097b4a65c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 09:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 451c69c1a808f68686def03cb8ea47ca SHA-1: 90a64cc613fda148225343c44bc7817dbb1acd77 SHA-256: f3d524a097b4a65ce91e0cf8f17668e8fc5a232f322f84c5b3ce3044162166f4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to these compromised sites, which are often used for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ee64d85fd4d---39880305712.pdf In PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/67757273774.pdfIn PDF document text
    • http://taumed.kz/upload/2021/08files/2108151725131885420rhr6.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/aa64d8f72e86a95a143ae15f3b2919f3/21403053253.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/nozoto.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/77605117002.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913f2f5a008---zelepop.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/4977770327.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/77999224668.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/vifopisozeko.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/tutuxuxevaxipajulenozerab.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8dd0e1a42---jafubevelesono.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/1679136930.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/varekowinewomexewudugebu.pdfIn PDF document text
    • http://flirdining.com/uploads/files/41612437189.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/27276949926.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf0adc658a---88061147507.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/26658840786.pdfIn PDF document text
    • https://banghenails.com/upload/file/litususudijutomojotige.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/76137013494.pdfIn PDF document text
    • https://kawanmto.info/contents//files/wimojefeduguwaxorex.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a496dd0b6e---66787766338.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/dupokotiterifewogokupes.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/f07v1olp5a6nsg6qjn23bnh7kb/69010292843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=different+types+of+leadership+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_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 10708 bytes
SHA-256: 4f017e514a7518d3b6fd9a7b1121cb2a09e835bee93651fad017df97065c2304
font_02_sfnt_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 17092 bytes
SHA-256: 564d6af43c6dabd3ffe0acf49fae520f11e07bfdb32d6043e26fe28d5e2d52ac

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