Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45fc5747728bdb8…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 07:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 787634c986075b5464bdd3dce63bc460 SHA-1: 52891b76d421737da9c675732e63751fb807ce4e SHA-256: f45fc5747728bdb8d77cb05a2fc6dcaa0ec811c4f21774c0f1c02ddfd1038e44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143c9cf7d1e9---xumifekukajurazapikarene.pdf In PDF document text
    • https://nic-irq.com/userfiles/files/wikefejawunuzax.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/80524021653.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/navuji.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/lubologumedusabawuzejolu.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/27002652239.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/36231184530.pdfIn PDF document text
    • http://hzqzg.com/d/files/64920071544.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1f0e4b1702d313fb44ad1e3285a8fc7e/54247365414.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/gijenavejadifi.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/dexiluvukoxenutoge.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/puranaviwu.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d864bd3165b767c448d3da0544410d79/jabolunejevizupijoma.pdfIn PDF document text
    • https://securitydm.net/slicice/file/63075477852.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/5079186578.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/10724859654.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/91074101399.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///11983957102.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143eaa34252c---samegekotupowukowatub.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/90653247226.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/65836299139.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/23040466039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=calisthenics+beginner+program+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_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 17780 bytes
SHA-256: 34ea3264d0bceda0acf3fc73c90de6c4731d7a35670bdca3cdb83d6aa756e553
font_02_sfnt_off00012773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12773 11240 bytes
SHA-256: 4ad392a6384f7bc8c5af7af7d8ce44a456706a530eedddc049e8b261ecc33350

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