Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be2dd57b05ee352…

MALICIOUS

PDF

59.4 KB Created: 2021-09-02 13:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b8aaadb90ee6379b6d76cda9809e072 SHA-1: ef64be0e00e78fce230d2af1579a56c452ce99f8 SHA-256: 9be2dd57b05ee352f6a1d819a5b06dd6736dd598d48d8396012c7a21d8eaa3cb
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection further support its malicious nature. The primary attack pattern involves luring users to malicious sites via a seemingly innocuous document, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6508

Heuristics 5

  • 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
  • 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://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/86abaa1373795f5fe4f268da22522fa8/mofuborobo.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d42b1353d3---zonakopifizeneze.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/fn811j9am4e8hsl3gm62bfa9o1/vedomor.pdfIn PDF document text
    • https://hirurgija.me//files/34558595216.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecec38cf54---57945874147.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bp9b4og992ntl5e105e3jdvip1/31032159243.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/fepilefan.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/bmq1f30r975i1ebd8pdb2uihi5/87785070639.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe1504b516---dasipozezesivuka.pdfIn PDF document text
    • http://eramaztravel.com/bot/ckfinder/uf/files/45031083296.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/bokezuwonuveribamej.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/97829532259.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/12705447267.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/zekopixopob.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f622b55d6f2---70370536627.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/7675578638.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/vabolinedipilotig.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/pliao5khplhijt0vrs330tsgv1/vadaritidojire.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f6536cab---89993672223.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/266eb4751a2403232136bf599129c88f/dewumetorikexaki.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/25d639d506818518a88f45c1b043a886/31830806394.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/16292930922.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/xifosifemovafugogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=worksheet+on+word+problems+on+linear+equations+in+one+variablePDF 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_off0000b580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB580 11280 bytes
SHA-256: 59fbbd16b24d64d80165d47f4e51655a8f3e3eb25ca173180272821fb6085c81
font_01_sfnt_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1