Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d11cda2b6328ff4…

MALICIOUS

PDF

85.6 KB Created: 2021-07-14 02:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a5c9154df406ae0b8c7b8fcbd8ee05eb SHA-1: e188c5d73e9fffe9b6036ff75629d81c897a4860 SHA-256: 4d11cda2b6328ff4f741000d22d79bc9375fc63416d8cad757784d4caf2ef8cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://www.toptehnik.si/images/fimimijifilet.pdf In PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/70783593781.pdfIn PDF document text
    • http://meta-min.com/files/dokepudiwobom.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/ruluxuvixikajepasukadil.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c909e023fe7---sorenamorunofuni.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/83886998511.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec5b41fa4---lijan.pdfIn PDF document text
    • https://sealskinz.ru/files/file/31019278857.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8f0d245cc3f456436bb6d8c4a9c1e66b/69985626856.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/31fb216d99c204a476ecd098d92529b6/gefogowututi.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/98967594492.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/gubuxatubifulegemijexa.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/cbc7d1992f01990b545cbad3250ecc26/mekegol.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/2478230646.pdfIn PDF document text
    • http://renovator.cz/files/file/kexebojuzoluludevezi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c5381c5d8---61428533236.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/wanarososo.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/rufiresijox.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6fb9a429b504d690669650aa806e685e/84459997418.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/4mtj2h7e3ra3oqhr5n70rvaqer/xajupodogijokevolemuz.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/anoln0nam2to352a353e6t8n17/liweravu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16079c26fcc10e---10586849901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+aviary+cocktailsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 17140 bytes
SHA-256: 2b3a9e438681d83d04dd414b05ae442c69d78d831b0281e25c7f150ced1c4c14
font_02_sfnt_off000131b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B1 10460 bytes
SHA-256: f383ad7a45b742a9c47b64d4014977aeca4bc5845b82c5b928026dd2657cde82

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