Malicious PDF — malware analysis report

Static analysis result for SHA-256 434c0a7690beca07…

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 07:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d049befa58b30b3e5043438d8664f4b5 SHA-1: b149cef36da15b53603f862e5a15db8bc24b1457 SHA-256: 434c0a7690beca07be3f1cb11c4f5a5d5c709c2cc7eea07c42026c1ab289affc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb2ec75eb---94870183191.pdf In PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c733100775---tisogubolofevexitiworuma.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/gesumowisi.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021060205172070554.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610914cba74c5---watovupuvozopiremovofo.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/443257bbcfbe6087ca6f9c5633b946f5/meneruk.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/vezulanogufukikizaluf.pdfIn PDF document text
    • https://attack.lt/images/files/feguzetesenebuxutopig.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/89990675711.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/em6sr869p9tau8nr55hr25dsei/83495893592.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b502bcf540---69297816854.pdfIn PDF document text
    • http://sns.hu/_user/file/vonuwuzudi.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/92037755403.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8437899dc---libeginoz.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f666076fd2---24463610524.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/sofivawijowonufalivikabu.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/0td5rca5spkbrb0dls6khuuv60/67786911648.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d3491facd---dajudukizizuzuvo.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/naxemoroxekamigum.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/bolalazero.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/buveba.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/68690934410.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ik289co5nacf66d19j2c0n5977/60273999236.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/patapebulujepomipem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=rv+parks+near+mooresville+ncPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 10640 bytes
SHA-256: 45d7366d20e28d016c75a10ea772445d7e2b1368c166ebe95b861b02ecb46ac4
font_02_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 17736 bytes
SHA-256: fec8def6f745b294cc2ca0589c941cf8f2a37a35ea26eca9307f4f9920868b4a

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