Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ddf54354e55b2cf…

MALICIOUS

PDF

86.2 KB Created: 2021-09-02 18:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43b78ceed9f0163319bcfa07937a863b SHA-1: 4633ba758e7bbdc907a761f32d27c9821079df21 SHA-256: 3ddf54354e55b2cff6ab072b51269a9455c2091ff83d4c7357354dedf44cecd3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that the document is part of a link farm pointing to compromised or disposable hosting, likely to distribute further malicious content or phish for credentials. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.jobsincrete.gr/images/_user_na/file/sewasamaw.pdf In PDF document text
    • http://debeleven.net/UserFiles/File/batug.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95f983d329---fopomaduba.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/birikatiwezazipot.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a051551d326---12206323433.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717503126c1---gubelo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867799e4198---42634559465.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/10784436045.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/losoxisuvawobavigebixexom.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/55343112722.pdfIn PDF document text
    • http://climtech.com/files/files/98361284232.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1625141054.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5a7b47a6f---guvexiwuxaxa.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e85168e7cc7b6f759c23e6e365a0400e/66431747860.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4a6a3cbe36d64d78f5c664ac259d30a5/16148255324.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8b69e0f7e---32613869242.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/ziwekojuvarevewaboxo.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4a4882005df305f1b69eaf6b7bec00a5/16654094336.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/42521938192.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/k8qln1kno929h8k9tksqkh1tvs/wiveditufireraka.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1738184445612acb8e53778.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/tapizijudanenare.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/90630875226.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/79457993475.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/tukisebeligujutiwoboxum.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/661a6dc5002d45f9809ed59e2aeb010b/jizosopebixifozuwajib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=proyecto+de+vida+ejemplo+pdfPDF 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_off0000e807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 19500 bytes
SHA-256: 446188fed09ca7f5525cc3647c25157609912680dcafec97eb394607dcbf3298
font_01_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 10820 bytes
SHA-256: 08b18d071fd20b7155065ce99ed23ddbe86e98588f2064b146209200630773a2
font_02_sfnt_off00013301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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