Malicious PDF — malware analysis report

Static analysis result for SHA-256 359f51f537676e96…

MALICIOUS

PDF

86.2 KB Created: 2021-07-07 22:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37435eb86d19c3d42704b6d02eb3f2a0 SHA-1: 7b14b2fa14cf6ddea5f902fc21c445458b697a74 SHA-256: 359f51f537676e966ff977a097328bbf3f5f83bbac4fab11763b59d9ffb306a4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of a raw IP address in one of the URIs and the ML classifier's high confidence score indicate malicious intent. The primary attack pattern observed is a link farm designed to trick users into downloading a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00edb2bb58---puwisevobumata.pdf
    • http://raczcsalad.hu/files/58561026750.pdf
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/melotatu.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/gjp45314nhrr6mt01ss3oploj5/guzud.pdf
    • http://kimyasaldubeller.com/upload/ckfinder/files/3190359016.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b778b2bbfa---35449530053.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/lowokikarunexefenufol.pdf
    • http://wooshin.kr/uploaded/file/121060929560a26caaea14d.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ioqoo9ia063nrppp595qj0hu3h/sojegijej.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/bf35d452d7ca723dd1dbecdccc6fb99a/dovefiveririgupusumupew.pdf
    • https://empezo.xyz/js/ckfinder/userfiles/files/9345047017.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd0bb1acb4---63663890173.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/fp46jc6kv1ek58nfptmsr840qu/11202021079.pdf
    • http://157.230.241.115/image/upload/File/domigo.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607161d8d497b---zozadupodon.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/7r6v4peod216gmqigiupeqbb0c/93487487169.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/fce1ea71f323a3d9cb1988edbd619b17/54125172666.pdf
    • http://aj-logistics.com/stock/userfiles/file/59015396354.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07bd5006f3---juvarosumomepojekapum.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b228e65e77---fifumelipujozi.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/pf7lqom0uug7uch26pnb6os0ki/geremolipiditivepob.pdf
    • http://bagiez.com/userfiles/file/46265211843.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9748f15b5431fc3f275466b7769cbf54/63835964599.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+creation+answers+book+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_off0000eda6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 16792 bytes
font_01_sfnt_off000105bd.bin
d71e7715ef8bcb3faceafa328415a9d3af2d34d8c0fb36a23cf2dedc9a1c1652
pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 10952 bytes
font_02_sfnt_off00011ef1.bin
cd0de0858aa9427ae3a15416566bb63667145c24b08e964834ab9384738eb0d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 16700 bytes