Malicious PDF — malware analysis report

Static analysis result for SHA-256 1998edab1520c2b2…

MALICIOUS

PDF

177.3 KB Created: 2021-06-26 18:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 129c348cfef7d6812592b0950365afbc SHA-1: fcd6b08ce688bee4bc54412b8018b125a0953c5c SHA-256: 1998edab1520c2b2ccc9e1ffd04b0bad11bb6d87f9cc898d760340279d49a0da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with known malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cf124cfc7---folikipedisa.pdf
    • https://marmarases.com/upload/ckfinder/files/96482743070.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6caf05584b---lesavuzoxobeteralokux.pdf
    • http://bestbuyfromindia.com/userfiles/file/zexewofigawif.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/dc4qi4vshp2vi0os2sf6dejl76/fijorotuxaleninofebo.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/jkcpgubotesc4ti17c150aa1q5/jazagepubalu.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/ef6fae5bdb448558bd3ce53d60b1ab0e/luzigiv.pdf
    • http://chiengthai.com/file_media/file_image/file/napig.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088cf47aef73---xaruvu.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a095fa24339---34427080385.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01a803a69a---xinubovax.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf03e012c---vewemofejidedegeza.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/25d4189c1146bdab7797ef4814956e2e/peberetorir.pdf
    • http://amon-syotengai.com/userfiles/file/jefebod.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/d586bj6p6h70ncccqgua0lkb85/buxejenonakojeginajuruko.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a1445450219---wisebuwixakimugadun.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bef976291---37068778997.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/htj95h41m2hu764tlhd44d3kh3/pulorobizizovem.pdf
    • http://xlsferrosilicon.com/d/files/31852593426.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e5b296da---16749165721.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081aba27d722---40138451594.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcefb4224f---fuxebewadabakugo.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6dc90a302a6ab454e73a67efbafdf423/34793531301.pdf
    • http://serbanindustrialconstruct.ro/uploads/files/50218039795.pdf
    • http://ristoranteibucanieri.it/userfiles/files/tekiz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+thorn+birds+pdf+download
    • 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_off000259b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x259B2 16792 bytes
font_01_sfnt_off000271c4.bin
29a0e993bf1ff6fa8f65fe9cf54979d0c8a41eece50f4585fa0fd96dbccf7fce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x271C4 17388 bytes
font_02_sfnt_off00029ef6.bin
e2fb583fb8d3b657fcd5f8b186d2d797d098e13df1e85e498768912834bf4130		 pdf-font-stream PDF embedded font (sfnt) at offset 0x29EF6 10784 bytes

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