Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a656fa813d75d38…

MALICIOUS

PDF

85.6 KB Created: 2021-09-11 23:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8bcca41d8cef85f9d28ef4d7dcf6b644 SHA-1: d8c5253020079c2967bbc3626cf4a65ca0982b80 SHA-256: 8a656fa813d75d38fdd797eb79257d4310bdac695afe03dcc5cfe97e2af28354
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress sites and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=screen+mirroring+android+to+laptop+windows+10 PDF link annotation
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c8011289---mutituzim.pdfIn PDF document text
    • http://vinmexindia.com/uploads/27165078461.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4dc53d87---pipulovejuzob.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/79426939298.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/51154627083.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/xukajorenegagerev.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/wesogitegekuwopufikevegug.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e8264ffe---32969215737.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/20167766274.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/vakujatazedel.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/dunewimerajukaxafeket.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/biliduwofekovoxepodulev.pdfIn PDF document text
    • http://gibisch.org/files/files/sisibomamalagesigenivokis.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/fl38k4dnubjgdbnlo4rq6k9ct0/62705420840.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/45258662968.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/31925667768.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/rinapawadak.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/36781657903.pdfIn PDF document text
    • http://lex.tj/img/file/75326785149.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/gamude.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/89294442175.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/pufupojaxifedapiz.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/32270672729.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210902030151.pdfIn PDF document text
    • https://carlojans.com/cms/file/wuzesamodevoje.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_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 11192 bytes
SHA-256: ab0551980112f0144948e890cf7cc38bab175e1e15a41edb04674678856c16db
font_01_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 18024 bytes
SHA-256: 570f4c57e66bd1e0f44cb8a3c58ad5c3efd365ec835913a4a57e6ef66d5283d7
font_02_sfnt_off0001306a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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