Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee4d9d207b171e8…

MALICIOUS

PDF

85.9 KB Created: 2021-07-08 01:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a406aa1dfa3adf8d6918e00ef22ff71 SHA-1: a954788a8a7769d482ade3d495ce29cec3a634a6 SHA-256: 5ee4d9d207b171e8099acdfb39c5a6c8fed8ec5b03d3bc5ccaaf353b86e9f356
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aedwea.com/upload/foto/wetiwajes.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7a70f4f3---pimumarubebizebajolusan.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0a1da16f4eb79b72c6001d52d6d8b37b/85261944238.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9a06988a---75805999065.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7012f3c17---30893678461.pdf
    • http://aisef.org/uploads/userfiles/file/file/20738415311.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/e4ba237022a33531dc9dd1423739673e/58989618266.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a01aa018b29---wasevimos.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/6bsonu9t65bqiapi4fu2cr3cbv/safudolitemopezizatunud.pdf
    • https://suma.ca/upload/editor/file/gixexuwekovilobotujizixiv.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca17eec664---63165982369.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a216d3af59f---32518261004.pdf
    • http://kroonzuivel.nl/ckfinder/userfiles/files/88658832426.pdf
    • https://artenika.pl/fck/file/dalugakabesogalebazi.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a04a7bec68---vakufivi.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/vorenotedosirifaxebiwusal.pdf
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/0b611eb2899860990b00eeacea427c3a/19090169084.pdf
    • http://ellerbeefamilyreunion.com/clients/874543/File/1387877163.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a306707d3---wenewaminawemixaliro.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba74de54e7a---775639527.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afadf584085---27187798976.pdf
    • http://dvarenda.ru/upload/file/45839839442.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/avvlkpbc5ld5v8csdita9llfa1/41686306801.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a75716a2---xeduvobodizazezikeb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=two+long+parallel+wires
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e833.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 16792 bytes
font_01_sfnt_off0001004a.bin
4c032a90ef5dac8a3a56bc8c0c2229657ea6bb39088d19ffc784df6011df3536
pdf-font-stream PDF embedded font (sfnt) at offset 0x1004A 10380 bytes
font_02_sfnt_off000117f3.bin
10f073a742c865bbbd7973945cfb710ee3c445b47ed010b83734a03d737bb361
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 18908 bytes