Malicious PDF — malware analysis report

Static analysis result for SHA-256 f827793c68ede249…

MALICIOUS

PDF

64.0 KB Created: 2021-09-06 07:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5531e43233cd427f92baf5aaed81f9e7 SHA-1: 300a490f8d1fb7b08a2d07618b04a0950053b5ed SHA-256: f827793c68ede249f56f475df5000be2ba58c68e88dd87918dee3bbd7663d983
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5690

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 http://mpti.ru/userfiles/file/9270478224.pdf In PDF document text
    • https://avigailpekelman.com/sites/default/files/file/bevodotatuxenevukimibe.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210613213245.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/82433455015.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/gefetibikibofix.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/vazowufolatotolasi.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/a29a4795febc1211a299fc79c1b86cf4/49230077535.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/dilozazowegagigexo.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/suzajujotukudomazaz.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e5ff1475a---94178696070.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202177115726053.pdfIn PDF document text
    • http://ore-processing.ru/d/files/92412149514.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/80031339310.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/binirimimimexadorul.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/88047570361.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/16189365881.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/45853449873.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/71169476099.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2363f3c2a1d8ab482a64654d12966c54/wikirujofifuzase.pdfIn PDF document text
    • https://blokhol.com/upload/files/jatowi.pdfIn PDF document text
    • http://guowangcable.com/d/files/89913747810.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/slmcqoedsi1se5rb3a53a6hfaf/zanero.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ab144af58f762ac7d1b6af41c80906f7/liluxusupamix.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/xudaburi.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/e84aad79c4b567d37f00555ca44f9044/winizol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=glomerulonefritis+kronis+pdfPDF 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_off0000beb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CC 10728 bytes
SHA-256: 7716a76a5fd800a4d78804c7af52be65bb9d13931f88480ded7a42ef658564c4