Malicious PDF — malware analysis report

Static analysis result for SHA-256 a707aba01b84c98b…

MALICIOUS

PDF

87.3 KB Created: 2021-07-03 09:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4275afd5a42b7225102056f063a2d64 SHA-1: 034cd375a3bd081db2e3d4c491481edcddf7769d SHA-256: a707aba01b84c98b1a802a3b9bfb8e2ef03e0b0f3abb1d663b503d64f273556e
156 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 and disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farms supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://oniceh.ru/uplcv?utm_term=russell+family+tree
    • http://galantemontagnana.it/ckfinder/userfiles/files/tefezaduxidiges.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/4f8ncen6v6l6l8oevcadpgt3oq/71740188943.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b309c7a7c---48676248507.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/t9asai5i42ghnu71to9tkgdovp/bowewifowumofaxurokagow.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2c31140c0a8e10d71a6848360a19bca5/rexefuwilu.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a348df0e2d7---30769072870.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160821ef40da33---pizodafuwogadasora.pdf
    • http://norilskgu.ru/userfiles/file/88109564691.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/5056402434a796554f4fc9eca1a98793/jefimigubote.pdf
    • https://master-service.ro/images/file/koxojijuguxatinigiv.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/qja4p1a5jpete6dat2ir6bkh1r/29199613204.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a5d15d3fe---56853773602.pdf
    • http://notarbrazda.cz/userfiles/file/favigefizozikuweworasi.pdf
    • http://cleangroupbd.com/ck/upload/files/muninililak.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717dd3c1cd3---96974994324.pdf
    • https://summit-christian-academy.com/scauserfiles/files/mudutijadijem.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843e80c08ed---bovodegixovikifoxe.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/048c6e776ed5ec8a62a299ec32078e98/7074985032.pdf
    • http://dpsszczytno.pl/photo/file/91628390776.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2daa1ec942---wasitifaxuwasutuwu.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/914j7grtd3p82q84r92np8ipud/37898529094.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e31951b1e---simabisegebudipubal.pdf
    • http://sva-jeanroze.com/xmedia/file/60660327137.pdf
    • http://fantalife.nl/userfiles/file/23751632742.pdf
    • http://ya-ke.cn/admin/upload/lefojenorod.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/56f61357a8f408375c6bf82cd3261cff/50090332899.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05a0488ac.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f409.bin
3a877c2a23bf48fc8fbc4f53f2073aadd231fe3cf3bc92a2612e88a63050d2b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 10412 bytes
font_01_sfnt_off00010ba9.bin
5aab1d31574ad73bc5f037b4d141b4658b0f5ff3024c4f362a09e86d1661f5c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA9 16840 bytes
font_02_sfnt_off0001378f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1378F 16792 bytes

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