Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe608d57a9534cad…

MALICIOUS

PDF

71.4 KB Created: 2021-09-01 20:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fa51b19c32bf424308f2299c66fd886d SHA-1: d52312bd9412858bb2c2e5c9aac6d26fdf5aadcc SHA-256: fe608d57a9534cada9bdfecc475ca6985e1804225e65dbf0711cae432ec5e787
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laborke.ru/uplcv?utm_term=what+is+protocol+with+example PDF link annotation
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/tezukawoverutazeturu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be5ddeb4148---1595816953.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cebe2224f3b---banatoxevitetizixisudom.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/7555236679.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/pasewonutadipedodupolasag.pdfIn PDF document text
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/48944625551.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6a6ab3c7bfd2ad4b8370a2f7c9d42cbf/meropurepepumobewexif.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/74797374827.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/bupebu.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/82138090743.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/58662000890.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/resozobomaz.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/17928669686.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/juzorilaziz.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/56763961975.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/bpr1hcebn13m01rulni8l3fd6c/rosemebu.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/rusavuzawomojesufujaz.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/49795498315.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/65432425554.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/muwimafimukoriguzezizim.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/uucmp7320hi65pp1klqbqj5s1p/92352695088.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/ab22c17044aef9daa1578b2c7a5005bb/99282915912.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f2ba38493---texaregamapuzilejej.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/mawogunamolawolufisaw.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_off0000b730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 10716 bytes
SHA-256: e9472c81c424acec7299e27ec68abb6c209e6c360f660d83f40869e6593da135
font_02_sfnt_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 16284 bytes
SHA-256: fb5b6b2d9eb6c1ede2f953bd6de2c7afb929c87382738861e7ab4a141857b751

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