Malicious PDF — malware analysis report

Static analysis result for SHA-256 713014e629ba6d0a…

MALICIOUS

PDF

91.0 KB Created: 2021-07-07 00:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7b92843a5f4f996f9453177f17b49bd SHA-1: 2144f10b7095f1883a0e0f4489d32d8bcee31bbf SHA-256: 713014e629ba6d0aed3f1740aa48a5277bc011cc1031c84c395d858c90bef925
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which appear to be WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=assertive+sentence+meaning PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdf0924d95---27870404174.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc4b444f34---51521970666.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/duferuvotulov.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/85980814233.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/3db8f7cb7131fe4d5dc21a5eca47b9db/78886070022.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8359c266835dae78c3a215c63f000866/59723997490.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/nvvddho7bfll4etg0vj8aa37j8/bozokivixirafubutatavimaj.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/vedesodaj.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c39205ec---wedadenunugijerilusodefuv.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b535b26a6f---nalaxukuwisukir.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/19418172666.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0olos398s5iaq2q43rkojmvr4q/defopuzapageribu.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/4qtfcggvmsj6003j338sen8u77/88550893627.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/36715113346.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/5ufs40mka8610in941acmovk7e/xenutufumive.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5899783ed8---5602055102.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/93329806348.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/tusawikuwasolumu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5f4ee18f6---96400725108.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/24276763159.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8ce4e9e97af7e4fa07a9eee86b993355/fajobakuv.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/fegunukukune.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/94665864803.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_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 21632 bytes
SHA-256: dc9842338d4c1bbfc3c9a507c167e9536f9bba89657a366fd6cde62961995754
font_01_sfnt_off00012f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14740 10456 bytes
SHA-256: 12596fef6208662ccd895951a91ade7347d41e463b5d99b31078d97fd077cfe8

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