Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd688c82049df2e…

MALICIOUS

PDF

89.4 KB Created: 2021-07-03 03:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 023fc55d795c8c01a9a41569fd8bc880 SHA-1: 9711cfcf38208b510abe5c6250f0775be64cf9ed SHA-256: 9fd688c82049df2e064fcd429dc11d408d670d6f4ada24b5a27fc84994579e1e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites hosting PDF files. These links are likely used to lure victims to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16071fea0e6679---julakiravavedusep.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a66f9bc367883d0da83f1983ffbec109/podenavajinemexedunuxuz.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/hij3ctajagsa4sboitp6k42ljj/88432624664.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608736c13ac12---20948772284.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d669ec42335---gemotumivofezude.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e869776923---nasuvidada.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ecpck4pmoc41cth7lct6o0mc2f/sujiruleved.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/bobepesodarejimenukim.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/vtou6fhpq2ic4in7j7uspfelfk/30798029094.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/39498462348.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/fin4srtguckqeetj0pcnvq0dfn/jimizelominaso.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/waneregixirotetalaxo.pdfIn PDF document text
    • http://gabortech.com/admin/file/tixemonemixabegiduzire.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/ruzuxodi.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/9666294087.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c1807b57b85041510aba60d4676d1c93/niruvogulazu.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/7374288446.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a448ddfc3a---74648880304.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080b399e98cd---wisalekikuf.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/54327028555.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/66447133562.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/varavamelijeguzivoximabom.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/ralekowi.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/ggb4g5p6dkvrs0lki0av90a2ao/vimepegedogiru.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/87648972160.pdfIn PDF document text
    • http://allseasonsbanquet.com/clients/868236/File/timurudodax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=reaction+of+benzene+and+methyl+chloride+in+presence+of+anhydrous+alcl3+givesPDF 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_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 11764 bytes
SHA-256: ac0ad5b412e3b82daedef5a2af1fd4a726d9094f47374e4db70e697a92b9a326
font_02_sfnt_off000127e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E7 18620 bytes
SHA-256: a55ccb22e1745df2f421b899389d968a6a6fdd48cb08111040eb4437392c93fa