Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad75f60045b237b…

MALICIOUS

PDF

65.2 KB Created: 2021-05-09 21:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2420107a4d0f5cc84dbf1a6bd63313d6 SHA-1: f4356080c301bd5e1296539b26b8a5a412e805f9 SHA-256: aad75f60045b237b47bd4a8b1841d8e686b545df56ab3697fef645f9ceaa0f16
156 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to various compromised websites that host other PDF files. The lures, such as 'easy frp bypass app', suggest a phishing or scamming attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/vbop9b3h59jnal1ilgl57ajec4/99441803586.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f456fabf6b44ee60597781b820a9b872/26576246869.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080690b8804c---40905398609.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-4/20210504202729217708.pdf
    • http://alhouti.com/userfiles/file/62032338772.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607027e75432e---fufuvitimojuvivin.pdf
    • http://ajivikafinance.com/userfiles/file/xudepixasik.pdf
    • http://charivne.info/images/file/15964544932.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf8900601---pininelokuliladewitoka.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160979ef8d4933---tejes.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160867e64e87bf---35186358575.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea352539cf---48351902988.pdf
    • http://alexhofford.com/temp/files/file/56878857948.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ao8qhou7jo95vb27u0e0g9mmu9/94363468478.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/88ee19fa96370e8312de7d2820cce755/10100576366.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=easy+frp+bypass+app
    • 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_off0000c6aa.bin
8c5427d6ff73a9e9c407d8ec229639836e80878485c73084ba1db630e659bfea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AA 5060 bytes
font_01_sfnt_off0000d7f7.bin
8882ea463ca73373d55f98e2c03bfb2caa42a8b6c5d6f2a0828794e55c1558f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 9476 bytes

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