Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb828d408619975…

MALICIOUS

PDF

84.9 KB Created: 2021-07-06 08:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3726220ba37b36cf58044a1cde568b5 SHA-1: d5c289a9bbed276686371969410e344418b6fc50 SHA-256: 1fb828d4086199758f3bd852c5e824345e4c9e58cd85b55bddf7179cd3a86089
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. The primary purpose appears to be redirecting users to malicious content through a chain of compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://skipjackpoke.com/ckfinder/userfiles/files/tudenudup.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ceab4ddd8---jewubojafupowuzorido.pdf
    • https://africanresearchcenter.com/userfiles/file/21646313313.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c5c7eb3a056cbaedbfae8b04fad12e35/55924696279.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d2361f1dd0e22b8961f290c763883912/32627519977.pdf
    • http://erdivigado.hu/userkepek/file/kizirir.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/683f5617ed9f6b2f649f2c591506303a/rizesamusebopuzuw.pdf
    • http://spoilersmensgolfclub.com/clients/865201/File/lefaxamipileno.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf1c18c3f---janugezavuxodito.pdf
    • http://polyalpan.hu/_user/file/49694433498.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/n8653asavd0oja597ocfjs33v7/54706064737.pdf
    • http://chingyi.tw/userfiles/files/65806109440.pdf
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/wulaluzuvovorelijugumeg.pdf
    • http://cepsagibyachtfuels.com/images/photos/daxoximisi.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vo89tfdf6ior5ctk8vssrr2lfu/21557870422.pdf
    • https://vico-real-estate.com/ckfinder/userfiles/files/rulorikud.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/aed0cd4c0a7bc1e11e8502294fcd8f6e/pinojafaxola.pdf
    • http://chataphan.com/file_media/file_image/file/paralogetojefuvaju.pdf
    • https://sieuthimayphat.com/ckfinder/userfiles/files/rufubewudozazerojamadilo.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ca0ppgjhdbmh487eqcf99av6jn/buboxewumibuwefurodo.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/88bd00f3dea0a0b27c0f8b6ead13e33c/xadomasiz.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607997f8b0b8d---voxagosi.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e3105177051---44110004212.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pain+after+laminectomy+discectomy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc0.bin
94ca739d990195bfbc78c4a972c971620136bff604cc64f852727794e3782368
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 10752 bytes
font_01_sfnt_off00010484.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 16792 bytes
font_02_sfnt_off00011c96.bin
fe31948ffe7a07bd0e09950fc170a1733784459e50f87c16a7608b72b18ed07f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 16172 bytes