Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bd68f04552d750…

MALICIOUS

PDF

94.0 KB Created: 2021-06-28 22:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8db037c7b440b3dc979030b0e62be37 SHA-1: dc6d5e7a8040edf726493d3dc1af42e95fb85e60 SHA-256: 26bd68f04552d750922a16d81aef840f49f8e11f6a952faae67db347554b0625
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The primary function appears to be directing users to potentially malicious content or phishing sites through these embedded links, leveraging a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4764f18ed---romabujifedupozutisadadow.pdf
    • http://cymagun.com/userfiles/rademizanetozuwomaxev.pdf
    • http://footstepfloor.com/upfiles/files/79023886115.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/8d1c4ebc645650c6f49cc496e08edaf0/87220820500.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d2437d06652f4dfbd70ee7ea177c3e85/tamonixul.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fce24abcc1---lerix.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54d12a8315---52971854303.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607267c809f83---50532405070.pdf
    • http://carnow.jp/js/upload/files/48603909316.pdf
    • http://evevoyance.fr/adh/.-/file/86251436091.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/wizuboso.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/213a6e8d501c6ed306907857e14cf213/juvepoxaputenuzixiku.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/51ee95e1dc4bb5df642c6e10e20ffa50/99002326153.pdf
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/76767339973.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/p6uhl34342ckto3urgg6oc6taf/jetujur.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c29c82b1e.pdf
    • http://sacmacbook.net/userfiles/file/midudakegovugarujawon.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/1d26eabd582b2dab2a3dc3a2af7ab898/xidutesareb.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7e87815ce---42168179680.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ilkiq5o9c79b69ncf9rfbd6dvn/56081122363.pdf
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/movupokukusoselezu.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c3402a3dd---11363534660.pdf
    • http://ssujaxchapter.com/clients/83257/File/170761699.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088918013515---61841643346.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+open+chat+on+wizard101
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad3.bin
38cb5a71a7eabf63fa6f23128265858fa2b61ef429949e401fb54df91e28ff65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 4652 bytes
font_01_sfnt_off00010b86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 16792 bytes
font_02_sfnt_off0001239d.bin
04ce4c941edc36ed0e3ca96a7df71676375fb4d604e17ea512ce564a11691c2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1239D 10888 bytes
font_03_sfnt_off00013c9c.bin
59547249dcf4cc0bc7e866a7604ffbab49617419e0323e13301717b2cb481f87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9C 17364 bytes

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