Malicious PDF — malware analysis report

Static analysis result for SHA-256 10986a6e04fd6402…

MALICIOUS

PDF

90.1 KB Created: 2021-09-17 11:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59033126a9f7374923955f85589e6747 SHA-1: 70c2baa7defe9be54ae933f8d8fa3673eea47727 SHA-256: 10986a6e04fd64023605499d4a0dd5745a5481e74add831f556ca6630e8ffa4f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The PDF document's structure and embedded links suggest an attempt to redirect users to external sites, likely for phishing or to download further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3209

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 https://wastran.ru/uplcv?utm_term=the+father+movie+watch+online PDF link annotation
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/84216881693.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/29837342092.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/gexubabonozurek.pdfIn PDF document text
    • https://aedwea.com/upload/foto/31618832765.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3605b6147---37789711898.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/rebid.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/lugepofenetagijewowemana.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbed7060ec---34805112103.pdfIn PDF document text
    • http://calisnt.com/uploads/files/xetemujazibinokifokavo.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/11339019759.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/weriva.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/dorobifunezuxap.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141667d6c4f2---25906347939.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/37246326338.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/67686564593.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/85829184798.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/katodamizimozid.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/16515299460.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/kosarozebimuniremi.pdfIn PDF document text
    • http://zae.me/datafiles/file/gugovowarumazamo.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/71043591179.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/66797665391.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133929117a2f---70232268220.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/jewomalefa.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/21449385103.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/81134386379.pdfIn 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_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 10548 bytes
SHA-256: b66632cf662cca6dcabfcd7913793f2d85e79ecfa4a2faa8f251e0848c77360b
font_01_sfnt_off00011b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 19384 bytes
SHA-256: 887a1188f0f451ba66461d5f10ef7cdb8b7ad1f1b76d497ec2e97fd9109b9294
font_02_sfnt_off00014e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1