Malicious PDF — malware analysis report

Static analysis result for SHA-256 84be2b82dd5d3c5f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 01:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d5981ee5b1f013866afe1b117aaaeae3 SHA-1: 8985fb8e992d6010b8011d8140cea4d85a0d861e SHA-256: 84be2b82dd5d3c5fa8d3cade1a1db83037b71dd0ed8f0794607a794b8d824603
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of malicious activity, likely designed to redirect users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://alamansyria.com/userfiles/file/89831936836.pdf In PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/gufolumoxisalox.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f89ff59bd4---8030055179.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/e6qhocjc39s0p7t2p9fmbb2v22/kifutenedene.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/mupesekovepibo.pdfIn PDF document text
    • http://aven.su/userfiles/file/14762006204.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/xabevefaxujebibisosufuja.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/gasej.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/niroxikimurula.pdfIn PDF document text
    • http://rc-modeller.se/images/file///jorunivof.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/lupon.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/jr9codfp04guho8t9oipl63v6d/40135112472.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/pezolekamabapinipifezuvin.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5f09de2dbe09adb160a2b4e8ac5b23e3/vixir.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8d12e28b2---62170853065.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/28904527018.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/45754269041.pdfIn PDF document text
    • http://rld-carbon.ru/file/sorulubefozixixorevoxisi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aedd1507fb2---5579642821.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/budusu.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/vqas76a2t57b4jk2negh2e8mk3/93460687349.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/lquij4b88sel0a1ma285rup6e5/repunalexizu.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/gawovoget.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/27913684591.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb3e8b31a3---vepolikikig.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lmi537mima54h54tr8rrblq714/detemomiz.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b602a64bdc9---12027269054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=molino+de+maiz+manual+wikipediaPDF 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_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 10520 bytes
SHA-256: 1a071200268f4f0a4bc5d993842fbb4b42462c19b7b96a1a081f925d10b01a95
font_01_sfnt_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 20796 bytes
SHA-256: 08f6c8da8007c4278d4ae7d5c361fc3840fd80a20b516f42bdccc44b976dfe18
font_02_sfnt_off000126b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1