Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f35f5a01fbd06c…

MALICIOUS

PDF

81.3 KB Created: 2021-06-25 23:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c5118c90acabd7ef69944e3f578a58c SHA-1: 71c92032d914d1c2104eb7fadae7dd13edafc10c SHA-256: b9f35f5a01fbd06c1e68d12428ba5bc7bcd10f026cc455d7704b2f80c340c680
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://krisoc.ru/uplcv?utm_term=comparative+adjectives+quiz
    • https://menu2uplus.com/images/file/ruzaxevar.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f722bdf47e---sopipilidirifukejovetuvu.pdf
    • http://atmaircenter.com/lb/userfiles/files/tezugomixanalasejo.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607746014c110---pafisimozabowi.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/iu9i1kek12dg41ags66c5a2qmp/19710283301.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607568f547bb5---61186942156.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d038fefd---vigibunuxoxuvu.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b46d4016d2---34711824041.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2d035fce36da0df21dc826bfce23d3f5/vopekixuxagumigowexozis.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/20f92d885f502b6214f87d59f21849b3/pisotivuxewufukunenekelo.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/giwakibowovi.pdf
    • http://leadershipcareer.kr/fckeditor/_upload/file/29489705043.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/50fdupaa02ich0rtdkgjnraaf6/lularewegizitorozuz.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0dffaf9f05607b104bf188f8d84898a3/40914864304.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078c3d6b1d90---wagixirifakavumuzajirefa.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c207ecfb4---fulixameb.pdf
    • https://ludifrance.fr/userfiles/file/68150553286.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/lekebibej.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/clr2ggul2chu8svs824lafup53/foxojezikuwutonida.pdf
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/dikelaru.pdf
    • http://retroldn.com/userfiles/file/lopakekenoge.pdf
    • https://numen-wow.com/userfiles/cloud//files/pavuzexenojuginugodupukes.pdf
    • 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_off0000c0c1.bin
728f364f3722def7102d7ec180c0ef9501924a009faa03fee72af0fa910c669a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C1 17272 bytes
font_01_sfnt_off0000d9bb.bin
bca8e2ea237d01aab08d11bc658ccca5de4b9ab8f0f6f45cddb3e54edafcfea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BB 17032 bytes
font_02_sfnt_off00010628.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 16792 bytes
font_03_sfnt_off00011e3f.bin
0401778f08f228fdabc8cdbc370ef1b2d9710a206820ef9eb2124e217a4ff9d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 11056 bytes

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