Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bb2ba6b97d8eec…

MALICIOUS

PDF

77.1 KB Created: 2021-07-04 02:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ad16f6fe3759d714c211e4f0826d4a77 SHA-1: 696f7e821924c3b854db67834c7bd889cb6c7841 SHA-256: f5bb2ba6b97d8eec8ee0190babffc0ff5174f379e6ed5e8dec195f0b22f480d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it is part of a phishing campaign to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it may embed or link to malicious JavaScript or other executable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://historia-bfured.hu/userfiles/file/15459503350.pdf In PDF document text
    • http://ketoanaca.com/uploads/image/files/58940198424.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60c8df1c0f---50933078308.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609668515104a---89153464807.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/410fi52vcuki2vn63p1k9hupvm/5494094347.pdfIn PDF document text
    • https://aedwea.com/upload/foto/nunorejoviwisubi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ba6d21fe---41157262129.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/88963344334.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/menp56bot39rtsre2g4qo8rl5o/30062062571.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbeabdd71f---rovimuwudogeputofipipazi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2dadea3cf01606329d5d431212da6ca1/buliw.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/vepedomolokizes.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609104f85c183---xajonoxisixe.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/3d1mflh4euj8r8oh44m0v0v370/66749641951.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/48935737012.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/e52plrdvjt2ja6p27tenhr8cfm/divaso.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/eucc9rk8b9do7hgrfsgr47gr38/mezibixoxofilefave.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/8390871063.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071beac5e3e0---rulenifaxuxap.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec5d2c38db---goriguzesufafoz.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d62cd294d193da71b9559b2485070ebb/rufupasemosarorakavidal.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/73564520938.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/vu5lnojpkjdk38nfs4udaj3c62/dikomenisunifi.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/xotemedo.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/8o2hrp7lgu2s2r4uqqmf8iriep/6698764938.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afdc654538a---dates.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+to+office+converter+freewarePDF 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_off0000cc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 10408 bytes
SHA-256: 43cc4a10bdca1f7eeac4ac252821870ef3019f65a03ce6a2e50aca821477c311
font_02_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 16420 bytes
SHA-256: 71c0a2bf6848a96a5b8f819223e198e9aefabf41e9261cbc3f1a2a56dbb022c6

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