Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4f85b570271bd9…

MALICIOUS

PDF

90.0 KB Created: 2021-08-20 13:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 2199cf8effc025f7d17d591591d5b6f9 SHA-1: 7beffeee0e8b65b2462a3af6ddfd1194f940ef3a SHA-256: 5b4f85b570271bd967bc7116bcd4f44e96691a855a1b822867f496c99271c972
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to trick users into downloading malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d8d777fd1f32eadaf44a2c9fc0902940/mibelatefilavagodujik.pdf In PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/0f0303708c4cf2446570a6ed2827b816/lopugifanuronevadolif.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ebce3d405333c57dd8de1b0a69b9cde1/14453749588.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23959a8ab---faxifofosulojuloxinefi.pdfIn PDF document text
    • http://strandedtattoo.com/file/kawenezoj.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/disurebalidebofe.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/zeribewesevebosed.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ludejuvawoze.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/57bc095ede0343e7fbe4c3c15f572f08/fisiropivulilanodijov.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/83679285588.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/dekaliretavetijebes.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a964df1b0---jukumedemotefenagivatove.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/10055741484.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/jurimaxopem.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e32a9a0b3a2673eb44c1c1ab91691c5c/82592799344.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f30d3bc261---39136580274.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/78100760983.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/kenezuruduvibovu.pdfIn PDF document text
    • http://soupworld.de/upload/file/tokikivaraji.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/8479353611.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160740dbde6efc---morazuporifetut.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/guriwubunug.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/liberobadizatusos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=plants+vs+zombies+2+free+download+for+pc+full+version+no+trialPDF 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_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 11352 bytes
SHA-256: 3b739f872f1c4fb9bb0d54f5766f681d1f82938f9459d0b1747630c1fd57709e
font_01_sfnt_off000115c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C2 16752 bytes
SHA-256: ff6c4e5ec0f8b6090b20ce8cffb0f9b5366ff599efc1feffd46dfeef00a0bd9c
font_02_sfnt_off0001415c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1