Malicious PDF — malware analysis report

Static analysis result for SHA-256 6808656a3642ec1f…

MALICIOUS

PDF

86.0 KB Created: 2021-08-18 01:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2915e5b6dba94881b0b2c851647d7a62 SHA-1: 99f11cad4b91b72dbfb7329f093c812163f99e6f SHA-256: 6808656a3642ec1f9c44359647ebc52716cdb68fd03c960604279a26bc517553
124 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan. It contains a link farm with numerous URLs pointing to compromised CMS upload storage, indicating an attempt to lure users to malicious content. The PDF structure and the nature of the embedded links strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3961

Heuristics 5

  • 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
  • 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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06d0b421a---dapanit.pdf In PDF document text
    • http://austria-ex.com/images/blog//file/29794717733.pdfIn PDF document text
    • https://zzwgjx.com/d/files/wefewidaxogavuzufojufe.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/tesodolope.pdfIn PDF document text
    • https://hirurgija.me//files/46097790696.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16108f5523650d---29028878550.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/df890af8e24dcc217253829bc739a77a/rudofukomazotanakagurus.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/lajesorolokeduxilivotedo.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/suzen.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1c83ddf0d---12086032196.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be461788943---11399413181.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eb46ed9b5---vejifofusar.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/65225133327.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/gelog.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/09r5u5hd1kqp0vkfht20bet2k2/67645610987.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/simoxeleposazaxa.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210626_095124.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/okljbtjdqlasv9c2eota35fj6u/44494559266.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c5a9d72590cc40f482b186f9f026e8c1/nuwojarerikiz.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/d71839699fc894bfe18ff8a5ee838882/58412537501.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16087b07457fcd---62657262631.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/79016994103.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wenet.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d0450c72---45011600881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=industrial+organizational+psychology+jobs+in+californiaPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E68 11264 bytes
SHA-256: 0efb5d8c47fa76afc91df602c2ed34c1de86a843c6b2c242eb5805ec29a2a0c7