Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd8de915290b392…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 15:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57795e4b4cbd777c18b15c6e0baaabcc SHA-1: 7f0bdd506b34cf7dccc72f25a523389aae88f5c2 SHA-256: ebd8de915290b392d376c2afad8f41727b6195e6092b2847581fdf621ae7fb2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of multiple compromised hosts and link farm characteristics points to a coordinated effort to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://venusland.vn/app/webroot/img/files/nofarazinez.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161327ee405d10---18836925470.pdf
    • https://hiroyoung.com/data/files/doxuzudeb.pdf
    • http://e-restauracion.com/app/webroot/files/uploads/files/34665790438.pdf
    • http://mt-filtration.com/uploaded/file/930157687613c564b8afca.pdf
    • http://crmloccitanecr.com/campannas/file/xorewivixubezolilaz.pdf
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/faxowesefusutew.pdf
    • http://minerva-collection.net/files/files/nazexalabawidus.pdf
    • http://sibaco.ru/ckfinder/userfiles/files/palirilarikeg.pdf
    • http://apmnir.ro/fckfiles/file/pivumawesenererizasabof.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161485ee34ef03---golulojixesuvutibapexoj.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/48aaf7a18a4e140a599cfd208e335cc9/pusemi.pdf
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/voguwud.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jbmffdomgvm0bpre7tlkdi2p2s/2662729616.pdf
    • https://crmsaas.dswip.com/ci/userfiles/files/54116592228.pdf
    • http://www.pvvc.cz/files/9630649891.pdf
    • https://knurussian.kr/DATA/upload/files/202109211029032768.pdf
    • http://www.awakohchang.com/image/upload/File/235427588.pdf
    • http://kondicionery-shodnya.ru/upload_picture/file/pedenikamibajilepuda.pdf
    • https://butchercurnow.com/img/shop/contents/33710835358.pdf
    • https://mangonebike.com/uploads/file/58187395938.pdf
    • http://benetworkingpro.com/ckfinder/userfiles/files/zumino.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=install+android+app+on+chrome
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af5b.bin
5ee8887121f6665d5f72acd3ea78f74add1934e67da037a20fdc36e7cea34218
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5B 10728 bytes
font_01_sfnt_off0000c7c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C3 16792 bytes
font_02_sfnt_off0000dfd5.bin
292c7c6445cfac98eaa20856196ca056500cbe63c0f79653e572762a92d7cf51
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 16852 bytes