Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6d0ff307211be2…

MALICIOUS

PDF

78.3 KB Created: 2021-09-08 09:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec29e269c4f82c6a7b706f98af9177f9 SHA-1: a16915fb80ea6d1dc4928156d07c3fdec3b8a045 SHA-256: ab6d0ff307211be2fa1f3b59c624506dc5543f555aac75642fcf453c69a15176
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to manipulate search results or host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://a2designbg.com/userfiles/file/dizovapanuzutepoku.pdf In PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e768b46736df87ce04c54738f4ae182c/rujuxebupinaw.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611193a622e5c---85990545100.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/fifokekogaxewebimatetene.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/216385810.pdfIn PDF document text
    • http://budka39.ru/files/15168233361.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/21951794264.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/36313564205.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/91815669889.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/defiwosu.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a1266cf853fa8e0dee174c2e2949d9e5/xebafepelefabojekiw.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c277933752b289db1d40bbb41cd380a5/34399623771.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609643229efd3---64003825276.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/qa0h2b3h6deet23ije6ns05tv2/4947845375.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/nolud.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac5c16ddd---16572851880.pdfIn PDF document text
    • http://change-sexy.com/files/files/meweluta.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abaae6e9adf---lugufaweza.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/vogesa.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/zilizewavodikenujevo.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d37f050afe73424bd4d4d42f81dabbf9/88441717302.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/79816610646.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/tekaros.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/03a646e72ac730d8cee724b2b007eaa1/47393804743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=eaton+9130+installation+manualPDF 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_off0000cd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9E 10636 bytes
SHA-256: cda90de8dcd4f446d6179c13b5937029cbcd84ce0899cee6a3bcc1d53a2e6b39
font_01_sfnt_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 17724 bytes
SHA-256: 48806fcb961aa703e430268f5abe796e3914649efcd851c7bc6215db5e6b0a84
font_02_sfnt_off0001139b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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