Malicious PDF — malware analysis report

Static analysis result for SHA-256 5258252e5dcb8fb9…

MALICIOUS

PDF

88.8 KB Created: 2021-06-30 14:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 973d0a9af26e4c81c492621e07c92b28 SHA-1: c496ae7451b79d98609ddd6c69183a2e62218a5d SHA-256: 5258252e5dcb8fb9488ae2958b156e269a95b66eb05a3e41d940f448690b97ae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=the+largest+continent+in+the+world+is
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/6ce1f368eb4f701722404b2d7c74a62e/48188568422.pdf
    • http://files.ibiza-ferien.de/file/jividaguzezukepif.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c89bb0c27---nedibekosiwawenujatekazo.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd0b061cf9---tatunujid.pdf
    • https://egyiksem.hu/uploads/file/91771156500.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/0g6367jopqisbhfk6mmj4q8sam/begubagegasariwavoz.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/krjjkve6if4g1qhbnbb1d1s8s2/26662127528.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/rc6eo45rqomb5c3akpbv357vk7/54302899916.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f50d5fa3efbb1d6a91f23c80035a2605/runofibowuzudufufojuxure.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1b4a4a7e---pewejud.pdf
    • http://cosmikkino.ru/sadm_files/xariduzixixotoduxogezigun.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae014dd2cc1---nepatavamenolidu.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad966adba92---kidufajefakinegasul.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0748205f48---zusinefeledomazukuta.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/sdiu7bhg3el6eh1t1vmnf6k0mc/60771100022.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/6354cb26363051968ce3345164a5f711/ruxevoziwupanopuzumiw.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072e4a5d125c---zibabekenowalamugo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29b1e82e0---13099300931.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/qeok7skd8ltms1m6qbqi0e59ug/telutezida.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2835ef6d3918378ad1582d82dff4c342/kasosifajogupolepirojuxew.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/47e33abea1168905edca737850e306a1/dumix.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_off0000f6bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 16792 bytes
font_01_sfnt_off00010ed4.bin
775afac867ddf8cf82c94ae0c777ef1f59b8024d5b84ef0adf3d3cf3b5c9b1ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 10696 bytes
font_02_sfnt_off00012731.bin
93022a6242ded1ac8d1f7115c552490b60a7702c52314f84e9e9e884d842424f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12731 17300 bytes

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