Malicious PDF — malware analysis report

Static analysis result for SHA-256 8292ef3475aa8718…

MALICIOUS

PDF

80.3 KB Created: 2021-07-29 17:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a09e87a56e9a2247c293d2768243fcc SHA-1: 9a954919dd470f0ebc11cff9238153429b1f50d0 SHA-256: 8292ef3475aa8718a4141b256a727069189e8719f24ad9d4f7f87233a7de6878
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which host further PDF files, suggesting a multi-stage download or phishing scheme. The presence of a 'download button' lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • 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://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/uuhhbmd3safn6gpcl28mtrv2hk/xuwabijofofopelowika.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609736ea4a48f---ginuwimedonuwebin.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/5258493385.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/nebosajelukeriwinufam.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/iurp5503cgkaipcmpt36536peb/sonas.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/42815769515.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/64670283553.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1357d5879---93355686019.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b23723ea619a113d4b534df8aa63ee9c/jobos.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/voribe.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/gamojukufitakemakazunomak.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/78805779700.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1265da9a5b2b92c5b0a623ba3652347b/41279843898.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/8332066613.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/57309029969.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/36887718972.pdfIn PDF document text
    • http://normel.org/files/upload/file/jobogetepil.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/66433840817.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c335d412f27---banavatutenag.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/likivuzorisojoxebum.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/xojolokewigeduduk.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/31527870535.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6a26d069736a025a55ca1c3de198d1d3/74159988985.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/ed90cfbf4acc975a68260024775e3d26/xuwekeki.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/85931764944.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/saravujexapur.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c42c0c311fa---89033460924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+legend+of+hercules+full+movie+in+hindi+dubbed+download+720p+filmyzillaPDF 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_off0000d1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D3 11788 bytes
SHA-256: ac42ae3685ac3ff25368739076c14b6726cf926de018661bde0121d6eb55ee11
font_01_sfnt_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 17040 bytes
SHA-256: b4d7a4184050c5b8a80014c0655002580e5ef554101f2f97d47e920195a0b208
font_02_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1