Malicious PDF — malware analysis report

Static analysis result for SHA-256 95fe8ca5bd2aea70…

MALICIOUS

PDF

90.4 KB Created: 2021-09-05 18:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 41ec6b0505f64cf027cc4b7d3b915b08 SHA-1: c5378f04cb1d7d4a13ca19858a1f2ed8141df3be SHA-256: 95fe8ca5bd2aea70346fb98c7bd842a490c77e958458f310d1c84da2d095ef65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://richmore.kr/uploadfile/fckeditor/file/42147047610.pdf In PDF document text
    • http://katachizu.com/img/news/files/vomemusix.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/21997441470.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/3134182955.pdfIn PDF document text
    • http://lemfhafamilylove.com/clients/a/ae/ae548a02e38cf20d1222216853584fb4/File/22328821606.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/jegimiw.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/46799526719.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/97323833150.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/eutp8iojkku84cuejbn6mg8es8/99742169017.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/vetewujofodo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6176q0qoo5hrlicpkphk4rl1uf/zobepuwegitin.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/97699811962.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/kowikabidewosusipi.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/xolawisesalenobil.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/jufakuwumaxinipewu.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/fomarifelufugadubiziwi.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062102590525.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210823150152.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/66306399141.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a091093bb15---50700178479.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/loxakulidotifo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b567cbea2dd---81482768708.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/7261840935.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a97c57869e1---wukulezenirunugupika.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/68253461349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=algo+8180+g2+manualPDF 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_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 10444 bytes
SHA-256: ca24ae3274d397a0b93a33b4a48646e416468efd61868619ef1077a1870c92d1
font_01_sfnt_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 20900 bytes
SHA-256: 4f4759255c621207dc9bf54409bfd2b063ba14c792e2951989767a2380eddf91
font_02_sfnt_off000143d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1