Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a7184d7e2c709f…

MALICIOUS

PDF

79.6 KB Created: 2021-06-14 07:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88a5b922c08000ff420e4d9ba66a4bb1 SHA-1: f88b86497946474c9850b9454f046183d1f8f5c0 SHA-256: a0a7184d7e2c709f7c294e559583b6cb87b91a3f304e3275728ba8301e84675c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://philabc.ru/uplcv?utm_term=install+app+from+unknown+sources+android+10
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096a05784ee5---vopoworiwevetivora.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/fd8ok5ddrs25fnrd5ibtsh344o/11323446943.pdf
    • https://thehero88vip.com/ckfinder/images_store/files/kowimi.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089a433162f1---22673462544.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/82cfccd4b43ae326a7900a5c8fb5f36a/98492079827.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210529090525.pdf
    • http://birnagarcollege.in/userfiles/file/98624883237.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/277ad4baf4d3d91d8102776b2837f24c/kotutufefaf.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4ee298fbafc9a6c6d45c7c39704fe87f/nekurirunekawinefug.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad9b8c1d9---9275221918.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079e12809ebe---94091338601.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f669ca490a---83454157067.pdf
    • http://mobilesamara.com/img/files/file/nogosijemarupimagofa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f76f.bin
f497f45c12e9e4db831139f359086bb8d227ddd9ef8582ec9c7adf5d3068a5b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 5588 bytes
font_01_sfnt_off00010a77.bin
1897815c309810a342362aa0ee10edde580f48bdc7b458d9a30c436040078437		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 11392 bytes

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