Malicious PDF — malware analysis report

Static analysis result for SHA-256 6122c8fd5896916a…

MALICIOUS

PDF

88.6 KB Created: 2021-07-28 05:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e91ec888a1873f92308124d2120a33e SHA-1: 334f27d36a4d93afa91a2d92ae41e0440013867e SHA-256: 6122c8fd5896916a9340d897a3bd3f048a914d91e22d868a987b1ba064772136
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, consistent with a phishing or malware distribution scheme. The file's structure and URL patterns suggest it functions as a link farm to lure victims to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://tecnibat.net/uploads/archivos/62208739279.pdf
    • http://sanruou.com/app/webroot/uploads/files/4164220850.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b3b2d082086359c21faa1f8ab8d7ff80/vikifizolejusizazu.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876a8e3229e---43009921223.pdf
    • http://areaengineeringsrl.eu/userfiles/files/punawutadazeripolobuluzi.pdf
    • http://karthikeyanjayaram.com/userfiles/file/28795694969.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c393eeb9e7f---vizezon.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1ml0g5m3g4ckqf6i6b6fp8fnk8/vaveli.pdf
    • http://el-system.jp/uploads/2012/files/13847781972.pdf
    • https://ivanamihic.com//files/25477323727.pdf
    • http://edgecs.net/documents/73610611991.pdf
    • http://fly.no1-yes.com/userfiles/file/jalutetuxemasol.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb88ad152c---mutonun.pdf
    • http://lookkorea.net/userfiles/file/65050277485.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aef7d70211c---judunelurepakemi.pdf
    • http://vstarmp.cn/upload/files/20210710_105838.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608934b314dcd---65600089148.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/gj4re175qctvoskcchmi0u8m7s/lutixaguzitom.pdf
    • http://www.hydro-tg.pro/upload/file/15433333403.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/14a4c5b5d61eb8f21337d9e1707e0dcc/8597067955.pdf
    • http://nousgarage.com/userfiles/file/59210764716.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6026243e0---11535984998.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6efa393dc6---90699811477.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/otlcvpc998f9h28rcoeu4b4r07/94202074832.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cambridge+english+for+engineering+teacher%27s+book+chomikuj
    • 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_off0000f1d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 16792 bytes
font_01_sfnt_off000109ee.bin
d0355f07da592e627646e0d86183c7b1508398b14ddf62cb0cac0d1d8b2a3df3
pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 11448 bytes
font_02_sfnt_off00012497.bin
73d47cc8fc691987600a81f198c19d99df8186f691869f90576428705a5fd6c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 18308 bytes