Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab505580eafde269…

MALICIOUS

PDF

106.4 KB Created: 2021-06-29 06:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 18e40c0f0152a6b48c8ab023a11bf420 SHA-1: dba692be1713b25bf157f1fbc5db67752e4aa936 SHA-256: ab505580eafde26948260286f4fd8fae89e22e212615b48250f80beb7191b50b
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with several links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, limiting the analysis to the document's structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 https://mytopics.it/uploads/file/dibeta.pdf In PDF document text
    • http://dhf-china.com/d/files/58417863087.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/faxobibagezesedugegawo.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/67458580309.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b88d651e2c2d132851a10c695fd716c0/84143861182.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082456adb173---komexaliwagapom.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/tonexafofudekug.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/49b0f15069e089510eba260c3912d311/lemipipum.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd04864fa3---20601919634.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/kipuwubabemeta.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/79675408064.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/fvudtngj6bc37h0i6e19tollva/mipumalerenu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bomivakujipovoket.pdfIn PDF document text
    • http://mosjob.ru/images/file/80360976070.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26602ddfd---2149798308.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/1c33f555667f6add3574786566c9393c/vodojip.pdfIn PDF document text
    • https://mollis.rs//files/ludovebuwitojex.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/kizamigaxesokuforez.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/58829324841.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a625db011d6---86191258803.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/lst5sj5be9jr3agkhq0k076u27/tojosutowosol.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed5cd334a5---43215224494.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210513/210513131026530541o706jtgpd2x1.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=irrigated+farms+for+salePDF 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_off00013c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C75 10544 bytes
SHA-256: 1410f76905bd93707e837153734403eb576038769e62d2f239b615dafe3e0a95
font_01_sfnt_off0001544a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1544A 18220 bytes
SHA-256: 9c06b032537d4254c022f67f8a3a6fb6878b1f35449ccd95df7423e1a957f1a7
font_02_sfnt_off00018473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1