Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5ecad642203066…

MALICIOUS

PDF

90.2 KB Created: 2021-06-30 17:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 81febd0be69cd6f888aad3f3e122437d SHA-1: 3f2ef14e748ba1bb861031d7340317ffda504853 SHA-256: 4a5ecad642203066c9e42d02f848c4a8e6b70e43656b5381e26fdaf970e4bc9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution attempt. The document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute further payloads or phish for credentials. No scripts were extracted from this sample, but the presence of external links and the ML/AV detections strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=short+haircut+for+chubby+face+male PDF link annotation
    • https://store-connector.com/_upload_bilder/_filemanager/file/buxawilu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97c37f777---rimetalonegafakijaniva.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/20589091836.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1303e63a8c---51679748614.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6dfcf1ca5---79566724912.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/xuvigilexe.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/420feb1dcb73a2956affe72a6a90b4fd/45511962491.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9495c3cbb---55907459918.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e98e609ffc---87573105117.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/jifijo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/nq4h5h6lroo1me4hmv89hnklbp/jubito.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160744842cf5c8---80908516041.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/mn4t49v5vhnomnevnfgsrj8cjq/rugixinuriwonow.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8bbs00p08nqfgb49tfdoco9t5/luboremubutivinuwuv.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b961d4aa08---rupezovisisulufezuxeve.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b167cfe06e4---62509637399.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/tebodipon.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074430759cce---lojutamirogusina.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/6371015294.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/3056bc69f19372a608c576439f4937b6/73304390838.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/pobujaritanoruxo.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/11470293288.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/robabufovunel.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/94340513598.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/bejipotevor.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_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001147f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147F 17096 bytes
SHA-256: c5eaaf3cfbaac1f5cd13c58887c6431b64ed64cc44cbcee752de65265a6edd58
font_02_sfnt_off00014108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14108 10756 bytes
SHA-256: cffdc2000094d748ed111c4fa494ff9063e99ba3376372bde69f7dbfd48f4691

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