Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f94a6aa237ea92…

MALICIOUS

PDF

92.1 KB Created: 2021-08-13 19:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8ab788e8d36fd216f2278ceb0d2c0aa4 SHA-1: 15d52df11b47b7080eff9953500b2da995326cd7 SHA-256: e7f94a6aa237ea92ff40790752bd8b7908cff89a8ce3b963dd528b08d1214245
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The presence of a link farm on compromised CMS uploads and disposable hosting, combined with the 'password-protected archive lure' heuristic, strongly suggests an attempt to trick users into downloading a password-protected payload. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://edinburghpools.com/contents//files/fuxumujomi.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607b24d759afa---puripozufinup.pdfIn PDF document text
    • http://cy2hand.com/userfiles/67411259697.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/leredumomoliwigi.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/1040266541.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/parevirutudojo.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/76246060170.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/suvokurotubalopiraxugex.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/dh5jiubqm7ga6mqkfsgha1h43g/39575479539.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610ff29a524b3---sumaparogexanusu.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/20705644620.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/zuzarado.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608735e47d9a1---pinuparanavuwutumoj.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/60400866047.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073759139a4c---12536964191.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/jirenelupipinafasirima.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc44dc2bda5---47619661186.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d6038ebe1ec20c98562089f02ecc0dce/27520567580.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/27101255428.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/8c80c019be631f1297dac026d1634a8e/memevadabunogevos.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/lisujinegivodiro.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/6lnik474da0idmhaejjkiui7do/kafukafokukejirisevimabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=descargar+nitro+pdf+professional+64+bits+crack+gratis+en+espa%C3%B1olPDF 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_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 18848 bytes
SHA-256: b2a69309116b9dd9ca2943dbdcb28c9ddad8eaef7ef43aaa28aee053bf25371a
font_01_sfnt_off00012b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14367 11480 bytes
SHA-256: 9ca84b713797c7f3f2b68c650e07ade90b271854e3b08e9b060f23fd198a47bd

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