Malicious PDF — malware analysis report

Static analysis result for SHA-256 884325ee928cb0e0…

MALICIOUS

PDF

93.7 KB Created: 2021-07-23 18:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e81e25c369cbf624f0cd1dca6ef28918 SHA-1: 8f01e93f2a3532760460f4fca9c209b8be92095c SHA-256: 884325ee928cb0e09f1660a6b4208d0111135480b0b07d7d4cb436fbe5eb1dd5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content, rather than executing a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://asja-doll.ru/userfiles/file/19359245547.pdf In PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/kerijetama.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/pusadukifenozafe.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/batefonizufe.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/9424661074.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zivadipafelisisive.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/wokedaduwikare.pdfIn PDF document text
    • https://people11people.gr/uploads/File/31657437191.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/86723523526.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/87134290476.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdee5c8c44---56903166185.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082387adf801---13601239552.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3286f8575b---kabiruwo.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9de32a47b---dufokesepinofus.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/65558845786.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/paxitagov.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/22132302178.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/solemidu.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/23cba7b87589e7678c862d841bb3f830/82412157090.pdfIn PDF document text
    • http://kalikraft.com/images/file/rafadagudavomibeba.pdfIn PDF document text
    • http://www.puhito.hu/uploads/32927131650.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd823f00e5---puraxaxidupivi.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e8faa5383---suzapilakurikovamomege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=which+garmin+cycling+computerPDF 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_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 17920 bytes
SHA-256: ec0a6e791233b6ae9f3b25e7ac1fc638dba51ecf801888da56f55243cf978d7f
font_02_sfnt_off00015070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15070 10860 bytes
SHA-256: 9e8e516d26b65c201a63c89e4603c2450261ee6c68ef924b73c383fff65b9603

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