Malicious PDF — malware analysis report

Static analysis result for SHA-256 57326a9a514e05db…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 16:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e709820aa90895312b817553f42f7f47 SHA-1: a85e5e33fc393ccb6ee4e490b85ff527ddc67967 SHA-256: 57326a9a514e05dba9055f882a7e7819f16aa12eb5a14a215f6706adae4d946e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS uploads and disposable domains. The presence of these links suggests an attempt to lure users to malicious sites for potential credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://emusicmarket.com/upfile/board/files/62847358297.pdf In PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/h5i32625cq5vsvfo0h9leo874l/jorafefizagosi.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/vegumefu.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/12441507667.pdfIn PDF document text
    • http://thevale.us/userimages/7154481373.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210902195504.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/31b4d7d0abfe329c79a6977138822dec/48493663964.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/65314860469.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae26352921---1364517812.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/sirexi.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132447753129---vasivalalunenemizow.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/kejokewotunukijoramufena.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/81378873319.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146cebc908ee---viwepikamejagozebikajal.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/rifijuzudawimoreg.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210904175605112.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///jaluvituxoregomij.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/91874996759.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/venediribateta.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16143d945577d5---38935925977.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/tusavaralagedagaxowabotok.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/69fa55fc5e23538849ebfa09fb0a15d5/18699347480.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/79791188515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+install+gta+5+in+androidPDF 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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 10500 bytes
SHA-256: 4de7f0a9fa944907a548923b424fb9de58e59153262270c20350c76a61a8d984
font_02_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 17444 bytes
SHA-256: 2c8feaa9313302bb1129625e5f237047fdf9b212513370a5514ff7cb1dd8dda7

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