Malicious PDF — malware analysis report

Static analysis result for SHA-256 01cd2b168255a69f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 01:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a55ca7586da26a8d9a50418a5b214428 SHA-1: a436ce839f40b1bb4b07a31c517e536b2a8c4aff SHA-256: 01cd2b168255a69ff6f5c969e77617879ef7f9e9e7feab60353189f9bf815fe7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://nscenter.cn/upload/files/legogujotanukem.pdf In PDF document text
    • http://polaryachts.com/res/wysiwyg/file/lijagaxabel.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/11409230986.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/nilewitupoguwiwogazofa.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/8deb025f18e45843a1e53faef9bdaf1c/58724894574.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/46616486434.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/81845907924.pdfIn PDF document text
    • http://sbkf.org/files/files/52077036713.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613610c7c2870---11280764558.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7f366eefb4246c54a259ffe9f3ff7258/99241606596.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec683e9f93---17344685101.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/78408862299.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/mojawirozazuxexolesezufom.pdfIn PDF document text
    • http://bubb.cn/up_file/file/fotovavexowixededafoj.pdfIn PDF document text
    • https://123natura.com/stockages/files/98233477905.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/tetume.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/temelajawonamabitugaxoje.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/25326931451.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/vufutafunixojifitibekok.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/18926189093.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/sevototuwuzowinali.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///lupebamekakaxiwokuz.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/rijunuxetopep.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/61726906444.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345a2c0378a---xabitavasiruxaboli.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/33831558623.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/408482192.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/nesetoxizofanoxukowof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+adventures+of+tom+sawyer+richmond+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 11168 bytes
SHA-256: 99dda8cd66cdb5db587b51f11b7a7bf22c4302d686388a10337acd00a40f0cc9
font_01_sfnt_off0000f3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 17712 bytes
SHA-256: c76f4cbdec9247d9975ab92f4c1d86ba8ea91409469617bde7260591b815d52a

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