Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c0098da7a41c44…

MALICIOUS

PDF

74.3 KB Created: 2021-09-19 07:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e3990fb28b2dd6dac5888e16f75d6c9 SHA-1: ac289353572006417c8245ee57bb33db01990802 SHA-256: d3c0098da7a41c44a0dc9236e42ae73aee515ae913c9dc0a977258dc5d60335d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=passport+photo+android PDF link annotation
    • https://tarzminder.com/resimler/files/26070330382.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/2296040950.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/midobuxibifubetejetig.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/reroradiwejoxawinesotafar.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/vukutureparorevux.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/290748129.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/nabanutin.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/75262097709.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/37495575657.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141609907a7f---zagozifozukatikujibapeni.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/vojulixuvilaxexifiroris.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/23628384162.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/ladeginirumuzigur.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/681e1e5deba312c797aef1f6298293c1/lodusojoninasal.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210907142511.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/naxojudiv.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411e7760451---ledesenomewetotutemo.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/6277517442.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/nemuva.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/98177322494.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/8a3f767b4f2ec9ae871eba2ef7d40b49/25860808224.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210908014854189.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/35089901387.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae72eb08c7---nijasesexakepefurenav.pdfIn PDF document text
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC247 16340 bytes
SHA-256: d85d555b79d0c7de119302de2948beaf95cf5ec46b0a55ea50b6a8aa0ec0e68f
font_01_sfnt_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 10312 bytes
SHA-256: 161e4bf53cc54bc7c68ce16d8993712fb4657247f4b80be38c3e558586432906

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