Malicious PDF — malware analysis report

Static analysis result for SHA-256 3149b1046c00358b…

MALICIOUS

PDF

90.5 KB Created: 2021-06-28 07:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61785fe7c019139878b34afbe06c5193 SHA-1: e7f277aee293f2ad8a52513015c81756164e8d05 SHA-256: 3149b1046c00358b5770b7fefa812433344bb8cdbc38477a933e87f8750c79cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=genesiscare+21st+century+oncology
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a1837aec---lazudalazobunagizikiv.pdf
    • https://swalaya.in/userfiles/file/funofogixekatunu.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2ff12aec4deb77d7a9ea1cd1cdc3bc3/zedisuvavetajesufalele.pdf
    • https://jurad.eu/files/file/36475542999.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f619eacd4---84127422860.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/4782c8a50edc2ca1580a03ad81e86471/93511620505.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/vozaxowa.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/5m5vne25cr8hnmdt9hebbqlec6/19463385499.pdf
    • https://bleikss.com/userfiles/file/mobumagu.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3c91f2db---93009537376.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/regamevebazobofirigawu.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/876ab6b415ed412e98c1f1bf0855f794/dizarolowimomub.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925f2ff071a---mijofalolokilumu.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/96eed6005973b4b1138cbd10c584a294/34575052031.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/9b830c16cc1005deb7d2d37789eeb239/65161370127.pdf
    • https://mytopics.it/uploads/file/58333128293.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759d5fdf364---40997496280.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f198300f6e---lopanaluwode.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/fd6a5eef18c34434165f27663606be0c/44844007713.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f52e8a75a---55100355544.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/vjra1lr0h08s5e2astre85f5js/sobevowasepawafitonori.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/jawula.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085658c1298f---litelodejate.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_off0000fea6.bin
0ccc49a0799e65a41c864a5a0548dbfbeaf5eabe56535fd5f12a0cbaf9e51430
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 10832 bytes
font_01_sfnt_off000117f6.bin
bd1b57ab0f177b12f5920b59ab4b45c1f1b3aef2af38b75abb006b611179ea9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 17080 bytes
font_02_sfnt_off00014481.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14481 16792 bytes