Malicious PDF — malware analysis report

Static analysis result for SHA-256 2419c1d636a391e9…

MALICIOUS

PDF

76.2 KB Created: 2021-08-28 06:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b243ee39c7383ae988e331f092ed2521 SHA-1: e7973f339562131c124f5cd95c8e508d1271532d SHA-256: 2419c1d636a391e97001e0c94273c9e8b7379b9b555103b94e2945711c7732eb
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 compromised or disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/tt669sjcqdg9nkn20l3ochch77/meloraviwipafigoju.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd91e833b5---kekavadosot.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/11376626580.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/razunikaxuguloxir.pdfIn PDF document text
    • http://tai-group.com/upload/files/84009193947.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/54638291689.pdfIn PDF document text
    • http://quinta.cl/upload/files/leribed.pdfIn PDF document text
    • https://dm288.com/slicice/file/depisagopopaf.pdfIn PDF document text
    • http://schokobrunnen.com/idata/viripukafagazidon.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/23049971731.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/40534055922.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/risejonenusefijifurox.pdfIn PDF document text
    • http://qdjshg.com/files/file/polulixobesikuzadu.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/34045940468.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/31523493747.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/lasukojos.pdfIn PDF document text
    • http://thailonghoang.vn/upload/files/gadoxi.pdfIn PDF document text
    • http://skomi.ru/img/files/file/purigadifisibenom.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/66391624223.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/barusovo.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/xamofofurisuki.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/33667517739.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/ec850c9bed8ea2c2688576f7ab1cea0b/43677762304.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb23c4170f---3357080241.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/1d59bd9a891438decdf59cf33fadd86e/34236658613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=newton%27s+second+law+of+motion+pdfPDF 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_off0000c348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 17808 bytes
SHA-256: d695482946f878c5a206b4985d64c329e6e9ac19f97cddaf79da7c94e8273570
font_02_sfnt_off0001096a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 10780 bytes
SHA-256: 87aa4a670f6023c1ed1d4caf2d9000285f0c360938317dfa424d50a033b065c0