Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20819ab215defd2…

MALICIOUS

PDF

94.9 KB Created: 2021-07-03 04:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0d5937ad48377a5e8520193fd3d120e1 SHA-1: 3dd65cf1acab2814595c15a7de6b5c00b5073290 SHA-256: c20819ab215defd2f04e62786f3c2f4d6d5cd908775479645f4f2369e3033eb2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document identified as malicious by an ML classifier. It contains numerous embedded URLs pointing to compromised websites, suggesting it functions as a link farm for SEO manipulation or to distribute further malicious content. The heuristics indicate a pattern of linking to disposable hosting and compromised CMS uploads, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 5

  • 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://medvor.ru/uplcv?utm_term=ankh+in+the+bible PDF link annotation
    • http://bukharasuwanee.com/sites/default/files/file/79886200607.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce5e603434---47692096788.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae8f6513c---madasugidilizumidibubo.pdfIn PDF document text
    • https://masihpt1.com/contents//files/judevitupug.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/82220535391.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/aaa43152c13b56efab6104b26fd16b48/nuxusivowutozaz.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ccv8sfh8lij0ommkt5jqkirdji/6197727525.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/i19b2h1va30hrt44p4g75th2tp/72275895391.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/tigapofaguwo.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/tetixemukoziba.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a4e2a60c---68750445313.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/bubijizobazewis.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609d217c7efd6---13330308998.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/sitojutuk.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/4b9uv7er6fnn6ds77i8clrt9ej/41573104312.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01ee9bd418---84736849402.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/mut5dj81tpmnh4ala8a9gjkogc/ralafoseruvedavofexan.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hei0qinms3h2tm6jmn96fqpja3/datenepebivudilukisafopip.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/tiguminewawopamonitetefix.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d81f1039539---42400196953.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/7ef3577f51520c1613d1c89cba3e8fe4/99380467830.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/sejitakopitusapofofovowix.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CD 9868 bytes
SHA-256: cb78ea69559ee41dca6faf6ec5af4fbf641ce95702011fcc5b63c54e23d5e785
font_02_sfnt_off00012a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 17888 bytes
SHA-256: cd1e6c5288a3bbce0cf45914b491840c7c4afb149979c2187ae0e7830a498366
font_03_sfnt_off000157a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A9 16296 bytes
SHA-256: 4fa5fe4db0dfb51ee74770d7d8b44c96499552e6c1998bff52a53e426263a529

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