Malicious PDF — malware analysis report

Static analysis result for SHA-256 76da3d426b7bc980…

MALICIOUS

PDF

103.5 KB Created: 2021-06-29 22:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 86ffa1f79f74203614f664e6fde43fbd SHA-1: 8fd78e93144524cccad267dcba5ca3d4c4363175 SHA-256: 76da3d426b7bc980d9dd99190dd003a51e55348a15cbabcf03a4aec7e534bb17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these compromised sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/qdf8ikp1fqn5rej0tra3v7l0mv/zunederapalaxudajop.pdf In PDF document text
    • http://beloezoloto.ru/userfiles/file/7486246465.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/65943465456.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/13259577687.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e4ab36d4c---femojeves.pdfIn PDF document text
    • http://sooclose.eu/upload/File/14490647885.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/29408686157.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/thb3ijdrfh37n0dug1irc3f5l1/defatixa.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/luph0m9cdo529appo3kaqsn77f/wivifumi.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/raleza.pdfIn PDF document text
    • http://altinay-law.com/images/file/bibawilaju.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/xazamesofel.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086c117e1fa4---50312395092.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/6posln82cg6tmad690di5almd3/wuvifuxibavewuwi.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/2qcir901aqj20klqau55b09kp5/gilukilotogosoba.pdfIn PDF document text
    • http://iltorg.ru/upload/file/87327248361.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a0e2ea193---jazev.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/0366d352a2dc108bf685dd0cbc99df4d/42079004873.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/lgd1siu6gndmd23d8em1kb4f9n/lafokexezezexatige.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa8d648c03---togupanemawusojera.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/3fa6af5f5d4bf4f50d459eceef8a565b/52770687543.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/920b53104fdd0fc6e1ee7ed1cfb70c32/vavebereferifojovonolik.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/bovoxol.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/29478914419.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/4774b83a0c6ea72932b3e89cae15d218/16147341980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=different+types+of+organic+reactions+with+examplesPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f81c8033e---26523269804.pdfIn PDF document text
    • 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_off00012b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B82 11228 bytes
SHA-256: 792ee27c118cd597096421fc6a17e42eab1f7ec4d004b0a2fc3419e517eef7b2
font_01_sfnt_off000145c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C3 18468 bytes
SHA-256: 8b98a30c04c26b02402cdb4ed094e97fe1bed3ec413915b1161475b7c5d089bd
font_02_sfnt_off00017652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1