Malicious PDF — malware analysis report

Static analysis result for SHA-256 b376c507eeac025d…

MALICIOUS

PDF

87.7 KB Created: 2021-08-06 21:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fec56a7d4897425f4dddac9bd5885309 SHA-1: 444f1229e6cf140d65e3cbf7a159c98d8585bce2 SHA-256: b376c507eeac025dd81f9d3b1147b834e3ff85e3c293f4dfc331d4306793764b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URI links and a link farm heuristic points towards an attempt to lead the user to a malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://apluskleaning.com/admin/images/file/95783231685.pdf In PDF document text
    • http://staropolski.net/Upload/file/dojugasaberejilusaw.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/96525073314.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/pebpm713e1cv5falhnbco8a6e5/milojaziveravafeta.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/26986266816.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd662ddc7---zijakuna.pdfIn PDF document text
    • http://cycling-software.com/files/file/jisebimavu.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/86067748039.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da5a2c9db4---biwujivituvogu.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dd85c80e0---nexatuwavaj.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/ledodagejijivitota.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/numemakizol.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/lofasax.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/gopevexumubelerulav.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/kakozogolekud.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/bimuzutolijuvopel.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/91952792993.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/de57cafea12963a4a2fb28228666dce2/91802089985.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/k51bpugfr314pcqa10cmfs8ib3/nowivanevo.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/diselilefu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a83ec3fe3b8c441d859c5554fd455ff1/31465794820.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/vozevev.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad94febe94---bivizetobokedafi.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/18374384980.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/riiqj0hoisl9fnqpcg5mgh8rc4/24194581885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bac+blanc+maths+terminale+es+2019PDF 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_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 11028 bytes
SHA-256: b588c36d06a96001a70a60d18a726ca71986c4ac56a72e22d14de798e867889e
font_02_sfnt_off00011f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F96 18796 bytes
SHA-256: af8a20b8f351713775eb7cd3606b06c0d0731eb5d7a6f2d9c449c214af1afd39

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