Malicious PDF — malware analysis report

Static analysis result for SHA-256 c525c7ea0c32552b…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 12:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33de54d7e9e9a798c5d7850a88cc2e7e SHA-1: 872996750b4302bd7cfccbb3bd6282d7f882153c SHA-256: c525c7ea0c32552b7294f213ed09460ed4939816be99f8f4b55902094527dbe1
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://acril.ru/ufiles/files/xerulapugar.pdf In PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jutaxa.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/c50f56f5fe00e282c11da47d561b3fff/12273350735.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/f30385470b0dab7f957fa54f2ec22b26/boselijesukofefudosid.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202108281717454853.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/58729c6cb0f16b3fc7a57bd3b8190616/lagofotazifuwunazopunab.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c496d65ffe---12358319662.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ede092eaf9ca312cc76deee8a8ac9e44/semikoxuweketewiboragarux.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/52875866150.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/matitowarubexakedepixaj.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/u692or4bs4v7q63llc32dued8u/vesotafewawulazikiresel.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/66513128133.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/1933e8063139c98cda761d3ecbd9813c/94084807415.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/59305943440.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/rorabuwakibosep.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6a2d31b62dc853bc446962063550a6e5/38138467229.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/bokonoli.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///38026900695.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/zomera.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/94667423258.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/71638164346.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/64783112910.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/03f7b4d64ad61df6d98d0492dba640ef/24375643396.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/3391140723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=toxicity+of+lead+in+humans+pdfPDF 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_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 17924 bytes
SHA-256: 309e204b17f67e413dad02f56cc706df8db4b0eb30b81eca73aa9ab93c0894e9
font_01_sfnt_off000116ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F03 11064 bytes
SHA-256: 2331fe226f96e4c9bebd452e5c731b930c587f5f9d4b7fbe5704d8375fb0084a

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