Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4527acf45568a9…

MALICIOUS

PDF

86.6 KB Created: 2021-07-29 19:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14d426741e168434b8bda2bffaf1bc0a SHA-1: 45d7135792fedb0790b2104a793af9a8599793a0 SHA-256: 7d4527acf45568a99ab5f2e1b1ad63243831b69781ad21acf5db93aaeb1d0eef
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a tactic to host malicious content or redirect users to phishing sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to create a link farm for SEO manipulation or to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d353162cd---1474281584.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e170dc810c---zudolabepinefupidujuz.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/nupupofub.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210708050035.pdfIn PDF document text
    • https://actorconseil.com/files/file/41254786415.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/jabutivedafonef.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/80jc8k7l7vdd2g9mhp7tsobvkp/bofagur.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/11074872188.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/sadufakiwosapaw.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d5aa71289---suworowoguzaz.pdfIn PDF document text
    • http://msiutilities.biz/documents/91172034770.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160926cfd7cb6e---sololanasirigepamuvo.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/uqqh0qul8amhdaaidnqs35oqta/jawibimovagogomesu.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/ximabed.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/44717178949.pdfIn PDF document text
    • https://bhalakusari.com/uploaded/ckeditors/files/11800041484.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e90ae268b4a26a05a67c7df2cbc84aac/tatevitesukovalurad.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/vopitopopopojo.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210617_083540.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/bd75924783a25609e1e05290e466db12/pewubutinefemodibudunu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/192d804791909436aa98d8643a33f4fe/bodubafek.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/teviva.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc81e34701---mobudukilufef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+minto+pyramid+principlePDF 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_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 10888 bytes
SHA-256: 1419a88ab5cad0b8b2987bbbdf2302ecd2b73c610a4ed0f6d888778824084096
font_01_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEE 17128 bytes
SHA-256: c73b28f99cf814f73f6d6d48c00b4f63df46079dfdb5028e6d5c93c0b7fd8b1f

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