Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72353531fbe80e1…

MALICIOUS

PDF

99.9 KB Created: 2021-09-04 14:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa56b67901a7484b2c2d3e08fdad51d4 SHA-1: 11946f32afb4f693cdb338ebeab0767615d761e3 SHA-256: b72353531fbe80e145d7241b853832e9be572e07e424fbe06073c2a9e5cc6b60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating a link farm pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest it's delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://ff-engineering.com/userfiles/files/damaxaduzakapimokin.pdf In PDF document text
    • http://terezszilvia.com/images/uploaded/file/lajirewasupalidevojiroku.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/32704048971.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/46034147616.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081323b80052---notejojujulopigoru.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/12931784998.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/medipukojusejetiwamobe.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xedobolosimox.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92f0480801---90969317624.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/94858972107.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/mazozibotozowo.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/80255596530.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160701594c6d06---64974659788.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/50149441435.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/zufabikakazovafu.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/xulevab.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7cb93886209d11e916b84b143eddab35/67235075226.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070f3716ed13---kugopuveperupijevuxu.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-8/20210708012315898885.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/gidotafobatujox.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/0f663d70a69b7d5f26ee220b77870aab/81297110116.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/9emojpp4b22ouc3eu4e2qst2dd/garatutifojoran.pdfIn PDF document text
    • https://epos.nu/ckfinder/userfiles/files/disogesaz.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/11730900404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=programa+para+recortar+pdf+en+lineaPDF 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_off00011b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9F 20768 bytes
SHA-256: 07bddb4cc0be517dbe2b9e8eb4ae5cb3d2511ad9762fbfd22e18f2d7f92cbedd
font_01_sfnt_off00015097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168AE 10796 bytes
SHA-256: 95d06dcde1d67369ae84a3af93cdbaccebe394d2957aa74f71f33f4dd8bae8e0