Malicious PDF — malware analysis report

Static analysis result for SHA-256 03be9f1d1b1e15cf…

MALICIOUS

PDF

72.7 KB Created: 2021-09-02 13:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 74b825947c2ea206b6765092c1c23749 SHA-1: 4f55c52255941093c02302e43aaa3ae39a2357b3 SHA-256: 03be9f1d1b1e15cfcef6c5b1fedcc9b5fc318256358c3d60a618d7586de66a85
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains hosting PDF files. The presence of these links suggests an attempt to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://smidgel.ru/uplcv?utm_term=labelling+the+heart+worksheet PDF link annotation
    • http://faw-asia.com/image/upload/files/zapivadavufotibodufusak.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/16099261331.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/nufidegomuzoxamonut.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/q7dk4r846s1g40ciepla3js8p1/77604687002.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/260423154533.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b735491a852---87612424715.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16124df14d7e5a---86646174262.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/tatisefuve.pdfIn PDF document text
    • http://polkovnik.su/upload/file/32730936446.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/40d75de8c9c5105947928536ce4cabbf/povavefegewilupujinoj.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/1957964105.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/23410575822.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080375e0c90a---47357036337.pdfIn PDF document text
    • https://svetozaragro.ru/load/file/xuribabilumomo.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/723152b99d5a66241c8997714ade9b0e/zewafip.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cccf86933a5---rasoripinaganuzigeve.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/36508020453.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/99280354590.pdfIn PDF document text
    • http://rayanchem.com/d/files/18454767984.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/1561420267.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c76b60147---virudovalugixopolir.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/28926434418.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba15ecba64---danapibamurixamoreb.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/41921494006.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/pepuri.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/gatuf.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_off0000bcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC0 15604 bytes
SHA-256: d35f8b604ca4dd7bfdf64168df76e953da4e9d3a2a40674e72672e849e47e38f
font_01_sfnt_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 10660 bytes
SHA-256: 1e54ac690e8b3cd640c065e94d3de184bf306b52088932e1322bda831d6e1891

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