Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7867a836bf0376…

MALICIOUS

PDF

98.2 KB Created: 2021-08-19 20:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2dd553a4c594782ac3b912bc7eb78c72 SHA-1: 3b69d326740a546176ce9a05379147e310d5c139 SHA-256: fc7867a836bf0376f6a5cc414858b6179abc78e7624a707171624e9190ef386f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bukvoznaika.ru/ckfinder/userfiles/files/vukesomagujiwukipalesi.pdf In PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/434e0caddb4388a4ed4a2bac1d6732a7/84505757604.pdfIn PDF document text
    • https://blokhol.com/upload/files/3272937170.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/pulelatujiwaruwirirate.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/vebebomodopuriviri.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/2322093804.pdfIn PDF document text
    • http://nashcentralfalcon.com/clients/d/d5/d5bea9c86035def548a020f7371d19fe/File/92601733736.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/xivopaneridi.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/77482900533.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/26392462607.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6959d4ad0581c0965dcc9bf2efd8638a/zukotusimagikedorolesa.pdfIn PDF document text
    • http://ore-processing.ru/d/files/11060957102.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/49125649302.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/69620755290.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/73242624564.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0cf6af34---kiwogobukajisino.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/xexemijeg.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/72169863195.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/godaxupufabudorubifilina.pdfIn PDF document text
    • http://18554080.com/userfiles/file/1512990522.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/vinidonenufu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8c6cb7e34604efb2d9f6142add04ea5b/62186642507.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/pizowesaxolidezis.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0f688f21e---43387511843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=corrig%C3%A9+livre+sp%C3%A9+physique+terminale+s+nathanPDF 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_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 11308 bytes
SHA-256: 7c75590cbbf6d6973a7fccdb481fb33852b4007ac67b42001dbf1aa39cee3897
font_02_sfnt_off000142d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D3 20684 bytes
SHA-256: 49c12b9bdc439a1e50f67f0980225ed88e0dbc1a02072bff3dab6f9476530ab7