Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfc7f3ba371d562…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 12:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6927f32cd7fa4b3a535ada663fc7144c SHA-1: 724cae2b096d909cf2a8b5fe3fdb7b7c3dc8bc90 SHA-256: 7cfc7f3ba371d56228cc5b6ab1322a1982453148d4b17ecfe40b0212d878b47a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to evade gateway scanning. No scripts were extracted, but the PDF structure and numerous external links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=how+to+change+telegram+notification+sound+android PDF link annotation
    • https://sanvexe.vn/webroot/img/files/zekanixirodoranezer.pdfIn PDF document text
    • http://rotang.net/userfiles/file/xeruxitos.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/suxaxemedivogafewerebul.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/rebimitilitazavofagosose.pdfIn PDF document text
    • http://polipack.ru/content/file/87530817868.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/ferajiligasujimobolete.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/94190859437.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/42884518066.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387e2fae2f2---borabaviwile.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/99679897999.pdfIn PDF document text
    • http://mcutech.net/files/42975280625.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0252126b---28699407249.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/piwogopimasudid.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/43969228052.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/mokitup.pdfIn PDF document text
    • https://rinducm1.com/contents/files/lazelesibupapodofezumome.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/wokuvemalisasonejolod.pdfIn PDF document text
    • https://ms02bet.com/contents/files/10328155824.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7cb0fe0f5ae4069d623fb0e3919aa7b8/66041760386.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/titunujabawafu.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/joragufexevirabu.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/jivovitujebutujetuvo.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/9091323008.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/777c0t0cma1cdk8176bi0eas61/58145409464.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/nuvezatipifa.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/zetatuwotererukikobiku.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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 11100 bytes
SHA-256: 9cdd1cdb328d5ed639fef85dc8baaf3a7a4e61daa75f066abe698a8a70862192
font_01_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 18972 bytes
SHA-256: 2f0f3bcc2c8094d3b922646c3c110958bb99f992eeff53bfe5a44f0381e381f2
font_02_sfnt_off00012638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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