Malicious PDF — malware analysis report

Static analysis result for SHA-256 579d2fba95f0fafc…

MALICIOUS

PDF

96.8 KB Created: 2021-07-26 09:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a97dc40c9a58cd35af604ee29aab5d58 SHA-1: bfdd546b7fad3c9e758f62d2d558de6436544709 SHA-256: 579d2fba95f0fafc600cf64861c970b6f0080023a535b9f74c8c7736e0790499
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://euro520.net/userfiles/file/162179659949660297.pdf
    • https://gyandeepjkss.org/userfiles/file/jamesadodemokagifona.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607063d5595f1---moror.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da7d18d8f---42811797965.pdf
    • https://khangle.vn/uploads/images/files/gurezalilasepobasuposa.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/722603972b8a3aacc3001d96a1c6d0ff/zanalev.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/f41923d966907dfe56a814186d6bea05/42477488312.pdf
    • https://acryl-bg.com/userfiles/file/31576782305.pdf
    • http://qunjl.com/userfiles/files/ropebovarafefesalab.pdf
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/kugelolajuximuvodadawe.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/4a74f145cb3cc4945379c62b36f6c6a6/zaxabazajetum.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tejenizoxejalafuguruka.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d3c0fdf7---13087762414.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/76ah1892ctunm9k9gn1fos7vs8/pibunojajega.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd2a3d9a1---suwenuvoxod.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/wujituvidotel.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f176f64429ae0976b0290b52d199ce64/wepubawotuwakivopubin.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/37f6e054n91nb6h20kk3lccon3/gixatabifi.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/3141ec0d9063650c94e640e5f341274a/xedenake.pdf
    • https://anjingliar2.com/contents//files/64365265947.pdf
    • http://studiotecnicolamanna.com/userfiles/files/24174089827.pdf
    • https://accuratesearch.com/userfiles/file/durirefi.pdf
    • http://edwardlankin.com/clients/86087/File/17450296748.pdf
    • https://muzeumkonstancina.pl/attachments/file/48787940243.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/43617239928.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mapa+de+puerto+rico+con+sus+pueblos+para+imprimir
    • 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_off0001101e.bin
0b9c12668f5b13f8877fcd05a37a5bad04288fb8dfdd703c4785357eac0e36b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1101E 19628 bytes
font_01_sfnt_off00014226.bin
9e6b594d4011857ce04fc6cb6b8637ee8c47963ba4a8b6481aa18f44c4e442e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14226 10908 bytes
font_02_sfnt_off00015b1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1F 16792 bytes