Malicious PDF — malware analysis report

Static analysis result for SHA-256 223bee6f1fc1d9e3…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 23:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d54a1fb8e48d3e50d56d36acfbb9ec3 SHA-1: b46c5e709d3586ef1a48c6cd9e3366ed8e7397ce SHA-256: 223bee6f1fc1d9e3c52413bf2d26999bb12300fbdd2d7e101a915aa8bef47337
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on potentially compromised or disposable domains. The embedded JavaScript likely serves to redirect the user to malicious sites or initiate further downloads, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=ghd+live+cricket+tv PDF link annotation
    • http://epmresearch.org/userfiles/files/28996956147.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/13501061361.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210919205234.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614413666530d---vaxopuseg.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f917e7ea5a8c060c395255f4345d6e4c/fuzoxejemete.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/nivajokofijobifubod.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/simivadimibijobujejiva.pdfIn PDF document text
    • https://cian.hr/userfiles/file/11303953326.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/wovuvolexug.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/15747798666.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/zibubuwip.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d9269493---81493584181.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/mufokibud.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210911_A3C4FC0149771A44.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/moludemuroxamugelusex.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/75627767763.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/44067299659.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161459f8592475---kowugesasaxawemagu.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/gezesegumepufin.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/68416379762.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/59637026775.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/kirewamuxiliwosubowipu.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/78674063462.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_off0000dc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC64 10108 bytes
SHA-256: 4f03a038c1c8f3cb4673827d8abcbe24f241f6852e467b1c1121fff06e377ef9
font_01_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 17568 bytes
SHA-256: 5d904affa41cd5be2bdd9d1c1e030979d8efc907d6f81df5fcfeb18de66c6a41
font_02_sfnt_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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