Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8afa4b764a6f5f…

MALICIOUS

PDF

83.0 KB Created: 2021-07-09 05:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0cc1a74dac0d4fbf57f9be429257648b SHA-1: bee98b5b203632c676dcc1105e6704b6dee4ce1c SHA-256: 4b8afa4b764a6f5f05b20ce21d132b3b669e840b8f9ee8a7b21bc3dae72ea857
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious destinations. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or malware distribution campaign. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080906b966fe---94618784473.pdf In PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e79095278f1c0e8a36597aec2c28119d/rabipofemetinuzowime.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/43635770661.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/vumirurir.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210624114709.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/440058298a1c40e10b1099f1d0a1400f/tutazeb.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c401354bc---76283772073.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/86379388724.pdfIn PDF document text
    • http://gibisch.org/files/files/86371270637.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/711f972ca7199c0a0224e843afe2e0d5/rexubixedolowatodivo.pdfIn PDF document text
    • https://nada70.org/userfiles/file/wenopenanozomuvixigazivi.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/bukumomafaj.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/d14tnma50q1jac4h33q1881tfu/50902773529.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f996f33275---51204752069.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/77187436215.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/a6da529c83e6f1de3ce3a52bd3620d0e/24885504309.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/65380333024.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/6f7efbc11482ef49264d24db1e25fdfe/61394624145.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/ketosuxepazoboxusanuw.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/7566204605.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077bc8dac51f---kotonigozaga.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c449ebaffdf---95899928089.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/26142109640.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fa810af7a---15503060782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=chest+to+throat+painPDF 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_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 15936 bytes
SHA-256: 95d558c720fcdc012da52f24447c51ce3e3092ea32bb42058af4d1100ae34479
font_01_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 10332 bytes
SHA-256: 2d9e4863014d37d41ffbce89c87dae6724c72210013f091f6ead284cc7548d96
font_02_sfnt_off00012696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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