Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f982e9b75995a04…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 22:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4be9432dfa393cb51ec353fe4d6fbc18 SHA-1: ecfac64c44ab0478272bf83b288b1d0fdbbf42be SHA-256: 2f982e9b75995a04bd3410cd8654ca650b645651aa095ba5fc6053ea50ccf593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • 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 https://oniceh.ru/uplcv?utm_term=free+download+pdf+editor+software+online PDF link annotation
    • https://comobrew.com/newsite/images/user_uploads/file/88704230140.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f1edf0a5---54320035117.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cda752f580---linujujolaxewuginofide.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/34205705471.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/xanubove.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/12446614133.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/funinevuzis.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bd8a82d44b28dda886326f4c5c7d998d/rufigejogizaxepol.pdfIn PDF document text
    • https://ikansambel.com/contents/files/kopamolu.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/41253238380.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8c1e9ace---xibinasubeluzid.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3c7133e0---33395777056.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/65542956168.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210823_304363D0382A9C3A.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/fimunekotomol.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/90448593200.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ea8de434---95330313212.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607acbb83d3bf---rivonixikozasovu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/0fg33l5ak9013mp8r1mag4s5e5/jusog.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/vanus.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/31594103628.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e20158a6345---44482138413.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/bumuje.pdfIn PDF document text
    • 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_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 10556 bytes
SHA-256: bb81903ceffe3bee857c3b610e69b291dfb9c316a06aa612cbf53fe9777af58c
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 19652 bytes
SHA-256: f2e86d3d52ed9da3f9bedbb3a6dfc58c7d698579f0074a653b83277b3edefc17
font_02_sfnt_off00012d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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