Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8600572e0714bb…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 04:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bb72d29ff5b1a171f355e923a765925a SHA-1: fd381a6ec50c4bfb278e48c4c11affb880e4c5a1 SHA-256: 1d8600572e0714bb4f130db5a4cb8c9b336ac6959f412aa527f9fcd657f79bbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm intended to redirect users. The file's structure and embedded links indicate it is likely part of a phishing campaign or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=pdf+to+image+converter+online2pdf PDF link annotation
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ee462056d---93137990624.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/kememiwog.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e5dbc3552334cd09fab4fe85558b4d5d/24635116671.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/220fbccaac68fff3325ec7fbcb8a7352/butiwisorome.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ca5c5d7abb---19689253175.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e54737ac45---foruputirozugaf.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/8213055197.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/83a951a1303daacd60fd959075b5ca66/82245824214.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210604120110.pdfIn PDF document text
    • https://andana.us/files/files/11081830978.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/wazololimukuwemugevutuput.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079bfa91d887---gisuluwonogeluwodolo.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/96615122882.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/80338544660.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/10751e50b89f04bb2938168f76f67ad9/57152783030.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/ganigege.pdfIn PDF document text
    • http://canoeing.by/pics/files/89922828333.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba673de13ec---10732819960.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/savoraladulamodam.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1fd4b720---68651334815.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/78391647295.pdfIn PDF document text
    • http://18554080.com/userfiles/file/zuladapekizexix.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/libunajavozizevo.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/32788837834.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/98616194481.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/e4b049bec84c91d04272b25f8b0c2572/fimilanizevogo.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/52407642660.pdfIn PDF document text
    • 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_off0000bc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC46 10980 bytes
SHA-256: f2bfbf7d6e17f69cc0fe5a3e1abf71e12bf89374841c09cde2ed5cf74dfc2b46
font_01_sfnt_off0000d597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD597 16364 bytes
SHA-256: 98d045fad9dcf3654fe6057cd7e5a50af4977158f709e16058173cc0be0da317
font_02_sfnt_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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