Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0faf42f6473b69…

MALICIOUS

PDF

92.0 KB Created: 2021-09-18 10:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e5dc76ca9aecf4e3b2f07bcb6b4373c SHA-1: 93c7d73d033ae01c235c7a438ed724ae9414fbf5 SHA-256: af0faf42f6473b69764e1fca22e7c0273be7c8adad37d10e0ae243be4e4d2e65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=after+effects+cc+2015+crack
    • http://studioaeditecne.it/userfiles/file/98247986003.pdf
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/44617065826.pdf
    • http://autosoftware.company/autoresponders_images/files/gowunajop.pdf
    • http://findacommodity.com/upload/file/jorav.pdf
    • https://dentalrud.com/userfiles/file/44774861469.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ece72d4c2878440b8883ae649b68a7cf/kexasazorokapirewolilajem.pdf
    • http://slsnn.ru/content/files/72185546492.pdf
    • http://www.srijonihealinghome.com/fckimages/file/5644815331.pdf
    • http://antitumor.org/filespath/files/20210902155224.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/5q90gpqiiik0kahmrnb7lvgmsr/75687276999.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/adf3b0eb37177cc2472e21f8669dc46e/dezixos.pdf
    • https://suacuachuyennghiep.com/uploads/files/gisekubakedadoxipo.pdf
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/93522867569.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a3ac4cf47ac7f68df90bb1a587bcbda0/24333590163.pdf
    • http://lasantitosrestaurant.com/userfiles/file/voguwijegejidaruvujinix.pdf
    • http://kodemari.info/data/files/kekuluvemelevuriw.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-9-14/20210914143217295719.pdf
    • http://hitelesen.com/userfiles/file/zovani.pdf
    • https://associazionebriciole.it/public/file/7779548676.pdf
    • http://extrastyle.ee/ckfinder/userfiles/files/nerolisuwaxepafubopujivad.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/menovasezeve.pdf
    • http://globalbizkorea.com/userData/board/file/70687044619.pdf
    • http://thienanglass.vn/upload/files/lulafemidefigasar.pdf
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/nikerojubavoj.pdf
    • 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_off000101ad.bin
a4b4656982bdee04f2b4fdcecba5bd08500e3bca13065fd2fa7d4b1d088449a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 18488 bytes
font_01_sfnt_off00013200.bin
b870170fcde38db1389ef6e085b2439a0fa637c0f902211329828cd740c4a349
pdf-font-stream PDF embedded font (sfnt) at offset 0x13200 10468 bytes
font_02_sfnt_off00014a2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2F 16792 bytes