Malicious PDF — malware analysis report

Static analysis result for SHA-256 5693520b1bd616ac…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 14:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 809e9e137638cea25257b480e379a731 SHA-1: bfb63ced697bccc2b61a6d9f00a7b4daefd201fd SHA-256: 5693520b1bd616ac5c10f790d0f33162fc06a7f751c920e82d85ce544b9e07ed
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or phish for information. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://woods-china.cn/ci2/userfiles/files/20210809072439.pdf In PDF document text
    • http://akkoryazilim.com/userfiles/file/32738946426.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///tumibotaro.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3bff82329082d3d874d25b9ba03294ec/zurapipesowiguzemukafizuk.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2927111dfc---97024775992.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/938c0f32c7c25b108c69d32bee88e8aa/97847273473.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/98146739449.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/nujizu.pdfIn PDF document text
    • http://artospace.com/pics/file/87321849296.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/1e6d6fe3019a186ae372e44ef1012bba/woxodumomumukijopagel.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/buvewodidugep.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2ebfdde46252404811350e5f5f836640/xisunadepekidenovujepu.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/17217681203.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099b8ccb3fef---zexovosaxafafil.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f37559dce05---pasupowi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2lpsa4np48ffpc4ie6vi7snd77/63030073139.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160847d913fe31---4789201153.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d3ff12b1b---51237799521.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/69998825738.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/gomepatudovuxuzexego.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/zadevotowu.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/88602431b388cc0f8d5296207942f3c1/lunebozesajewin.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/c8fa18a3810e071e62af73ef46885cfa/44117382237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=junghans+mega+solar+ceramic+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_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 10672 bytes
SHA-256: a0a1ef3afc67f216a80640b59f599d9557289bcfb0492b94d10a88fcb8c4e0ae
font_01_sfnt_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 17880 bytes
SHA-256: 0642ae9a1a123c7ff3c84f4db985eaeee60d508c4f22d1b7de0335c838459360
font_02_sfnt_off000118db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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