Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0336a798266f668…

MALICIOUS

PDF

70.7 KB Created: 2021-09-12 00:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f74e8ef531f28a9b0a896607b6edb60e SHA-1: 6f809c0119cb961408c303e7bcd23fc278781762 SHA-256: f0336a798266f668762cca598bc2e25685fea35f954be7b9042723998cd98c2b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The PDF's structure and embedded links suggest it is intended to redirect users to malicious or phishing websites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6872

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 http://gr-chem.com/upload/files/47779340680.pdf In PDF document text
    • https://mebelihome.ru/upload_picture/63879017606.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8471d11726d999b171e2bd55c9a56460/54631361867.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/fuzojanipilibutepemaje.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/32422469729.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/bewefumuzaj.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/zutofefebaka.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/956580d3d5f7ce37fced89a9be8df2bd/rejubotozobagiwuxubobufe.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/81809893909.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/93945992932.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109111711377772.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/bokogevafumomen.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/72245834134.pdfIn PDF document text
    • http://apex-architect.ru/images/file/72018421526.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/rekafena.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/m1he24j4d6mjeei003r910chtu/14473055113.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161350c7b187e1---87278947439.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/vipupafusuvob.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5a7c4a01---tomuxidatalatudibu.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/navibovegidevunoxal.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/veraneki.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161330e4b2b09b---wulet.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b1a07e87---xebozeli.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/vosevakivokuxesigefer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=advantages+of+using+interviewsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613549aad4e54---wozirikevut.pdfIn PDF document text
    • 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_off0000ca21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA21 16644 bytes
SHA-256: bd3ad36b64dbbee674d7ce3032debb12f8aa50ec2f2dd5bedcd7632d55f8f316
font_01_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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