Malicious PDF — malware analysis report

Static analysis result for SHA-256 0034b41009401137…

MALICIOUS

PDF

78.4 KB Created: 2021-08-28 21:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c0ded244a142fd105ae9541bc37a9219 SHA-1: 99f03be7f62b4568777dc0fdb1baf799df3ef8f8 SHA-256: 0034b41009401137dc94feef70d829278da8e1b59500c8acf4934618610cabc2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://andlupa.com/userfiles/file/fuzaden.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8eac55084f6436948aa43ec7e5aa7e13/94625540868.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba47e9abf23---vidojugusixefapapa.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/vaxuwizotodusudo.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/83866654581.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69774bf9ca---98747508453.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/4825262846.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a313a504e60---65159534642.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/memixede.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ahi3j1rdn0g1s1i3sp1i94lnba/45583523589.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/tiguzarimepotazuv.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202176197535137.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/mevetefefonijefax.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/fepogobepuresoveluvofeko.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/3da0eda31465e831fc1cee2bd30cd271/vemabesajawolegaxelomud.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/duxiga.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/sukasogapepugex.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/taviranadodiso.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c99a5f35780---65437255565.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/gedatatupubepetavasanabop.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/87298023677.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/fejevifefotewefepenewiv.pdfIn PDF document text
    • http://tfforming.ru/d/files/porivunuminosidef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=synonyms+for+no+onePDF 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_off0000d076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 10164 bytes
SHA-256: 5b1e87cca8db43674c7014398a789917fce30ba74acb4f2e19ae604da7c9b6ac
font_01_sfnt_off0000e72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 17336 bytes
SHA-256: 6064b836ba66faf80d64bdac15e82b2498d4ff4d11c812082cd5b3a778d39ee5
font_02_sfnt_off000113b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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