Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7026c21105c205c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 10:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8c5fa1dca6b81d43243de379e726852 SHA-1: df70c45f2072a39cbf2c9ea5b99247b50511f42f SHA-256: d7026c21105c205c2a458f2794e708b892b12d9cfed03a28fffe5d66c6516b9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a lure for users to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://jlicentral.com/images/authors/file/22960764620.pdf In PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/tomabexetefoxafuwadez.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/74029483569.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/selokawow.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/dedawen.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210909045917.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210916210925.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/99398652519.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/wexujabu.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/mezotekelonapuwasabak.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133644abd4a6---62440600853.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7917c589a40d901c4b76448a927c8bdf/20371640371.pdfIn PDF document text
    • http://marketingnews.fr/images/file/mutadix.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/kojakagowimelosuroloxufib.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161418fa659f84---92612979242.pdfIn PDF document text
    • https://magatek.com/documents/file/11475717560.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/99211545948.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/63934132661.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebefb313e2---kowiva.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbce54e339---kasikibit.pdfIn PDF document text
    • http://toonesk.com/upload/66491093469.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/zudilad.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbe81d7bc---wawafitixobanitubata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+gba+emulator+for+macPDF 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_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 10888 bytes
SHA-256: 5e4021bfe740e3baf822fe70e2ffb291131525a1c1c1e34e196b9084aabb342a
font_02_sfnt_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 18364 bytes
SHA-256: 304055e653fb0ebfcefdd941df97c3e0436623c425ab936442953383cabaeff9

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