Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a30449d8f1231e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-22 20:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 748cb37f18fb6bae6d59fcfb6c45878b SHA-1: 15f25314d455b53792961bfcb316463576ba1d42 SHA-256: a6a30449d8f1231e1f66c13699e10720929e2d245729bac62e98c58feec80d19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6900

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=angle+of+a+sector+calculator PDF link annotation
    • http://architetturaurbanistica.it/userfiles/files/95177658342.pdfIn PDF document text
    • https://mahae.hu/files/files/momakobevarujug.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/voneribarowejamirakala.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/90220468927.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/22244258856.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/vinuniragewefusuvubajabe.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021951050345877.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614aff18e72ee---49946036098.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/74772842819.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/60538195266.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/wubezetozebe.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/91363337306.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/2992832490.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/biriroresefu.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/79002405743.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613161bc44d9a---tamesizuvadus.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/sebusafiripiwokas.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/zokedolupaxopufip.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/zekeruronadak.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/97966856302.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/cc55108d71b158f1085e57e91a86a26a/lomegalipagubobimemun.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/73504730834.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf10a6c4ce---xewakikavotivubetujob.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_off0000d186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 10500 bytes
SHA-256: 66bea1900c798dd5d1724e0c4d6b9b9e7e40f1cee228b8b1ee861b9c666f43bd
font_02_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 18028 bytes
SHA-256: e2ba9c49b4cba4e5bd119e3c02c844bd8672c3b7fa972783e6bfa9e81fef4bde