Malicious PDF — malware analysis report

Static analysis result for SHA-256 a930c6f8a04a622c…

MALICIOUS

PDF

87.7 KB Created: 2021-09-14 00:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97f4e0fbe5310bb6bfc500d10525ba26 SHA-1: 587d2c100ab4b11a230f7011bd90b80d3bf6dd33 SHA-256: a930c6f8a04a622ca5453b0e3508a2be8f15be60d7085f074b5bf15992d55dcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://wastran.ru/uplcv?utm_term=dragon+ball+z+dub+watch+online PDF link annotation
    • http://cn-junsheng.com/upload/file///2021911132991521.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd726ccb7---pivotarosipesa.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/rojanukanako.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/77077548794.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/wuvavifase.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/81726468514.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/34394865106.pdfIn PDF document text
    • http://kyea.org/imageuploads/sirunuke.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/12894698617.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/sumularubozade.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/gavefodusixunolunipovibil.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/47938452033.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/13982485376.pdfIn PDF document text
    • https://premium-house.uz/images/file/41790098227.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/kalijixipunedobusovafaboz.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210910191832.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131fb09121d9---memaxap.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/jawurozi.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/tojixevoribamimivuzizut.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa2c87d632---jowelogevufidiw.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/wigufopufu.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/35312498437.pdfIn PDF document text
    • https://loyd.rs/images/file/nuvadelapawalibagodup.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/56120030334.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/nalafokoxobara.pdfIn PDF document text
    • http://it-hair.com/userfiles/tanevavaronuxuramidaja.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_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 17740 bytes
SHA-256: 0317655eff39d8f61d3a42384edbaae5e650d94b3a3a5248b7bff3737af21958
font_01_sfnt_off00011fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D1 10868 bytes
SHA-256: e571e0d0fdfa02af5a8aa4d18edbd8ded9456a47f802d6b76c46723123c15574

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