Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af0ca5919dfb362…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 21:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10212e57bda8e9c8e1eda084b45f9b1b SHA-1: 8cab4d2ad888699f4fd47abae1533bb326a8160b SHA-256: 4af0ca5919dfb36289ec7049c7507401ac8369bc15f1da66a4b9c298635a8986
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://porpora.info/imagenes/imagenes_contenidos///gaferedexi.pdf In PDF document text
    • http://www.allatpatikapecs.hu/images/file/49565469874.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/tofipuwixuw.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608068769e5cb---ponizo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096190faae9d---dopex.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161157f575406f---53480944043.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/21891919898.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/salokopinorujo.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ff3789683c8bc3502e5d16fe4b87387e/9791141876.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/gikilomavagosagaxavo.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/68998723734.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608364e6d4366---pumepusoxukebugo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a18e0489998---pezojowaka.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/98035157054.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/xekuxajoragufetazipubi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e3935a942---padonajelidareperi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0befad1a83---82612695690.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/33602230541.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b1a479a45---bonefuxuxu.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210701214142.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/48957218125.pdfIn PDF document text
    • http://asfalon.com/__files/file/46880144054.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/50645802723.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/35409814950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=compile+tex+to+pdf+pythonPDF 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_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 10580 bytes
SHA-256: a6da83af85b25d6bb19135871290a144e3fcbf042cbe7dbedd07ba40ce2e471f
font_01_sfnt_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 19556 bytes
SHA-256: 5229e858d7a0ebc255210d55364e88984dcd77f83dda2eee10b5e3698e2d5241

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