Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f72ffda74dc201…

MALICIOUS

PDF

93.8 KB Created: 2021-07-01 17:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf9d7c12c08c9daa38aa2f71b29e0a56 SHA-1: 0a0629c22553b96de282b7fb983448025b7dd264 SHA-256: 37f72ffda74dc2010e83238d18622dee3f87954c0ef1bac1774b4b9a776f7f47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, but the presence of a link farm on compromised infrastructure suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://www.yoko-ono.be/images/userfiles/file/jajugob.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff8564cac8---nawed.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/489278089e61803093744a039e3d0f84/52466818297.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072c29f9cae4---72273253103.pdf
    • http://drjoecarver.com/clients/49355/File/67320910110.pdf
    • http://hakkabrothers.com/userfiles/file///82391372480.pdf
    • http://jrpst.pl/userfiles/file/busuxanunuxusufawamiz.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815bdca3163---41062709719.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090610151985---vojon.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae9a38e0a7---wezurarefapubopofuvoxogow.pdf
    • http://adveotec.com/img/file/84542517074.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606efea368c28---47728995493.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/625f58dc437846cd40cfebb9f482a2a8/vamazalabodabu.pdf
    • http://gioiacompany.net/images/upload/file/biforujifaseredu.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/bdbbcef75f7eca61c45b5818dc30e178/6764263595.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b6345c447608ad5b99423d7f6521f3cc/jaxexa.pdf
    • http://sola-brothers.com/userfiles/file/31705161471.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094abb398be7---zezolegor.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/12b36bf044043a0ec588fe424950879e/4870698440.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160770e792a5bc---5131712206.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a903f0829399b50fc0991ef45aba73ab/lakapuselesuvanen.pdf
    • http://studiogaleazzo.eu/userfiles/files/lejabinu.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/palelifabibemaromibi.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efddeec04a---31334744941.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=riven+hint+guide
    • 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_off00010d03.bin
1e5bc4199213115f4789a3d45df5c90b989884eec3b38326b3653c402ea1a450		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 10144 bytes
font_01_sfnt_off00012367.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 16792 bytes
font_02_sfnt_off00013b79.bin
1f7cdd191d30fc28afd300c1e54fd11bd2f6786c07728d4025d5a37a47b9e1c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B79 17800 bytes

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