Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6027872e58660d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-03 08:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 96c8c14601e0fd1e5c74de6d3bf769e4 SHA-1: 10a59dceafb5a19b1f33748e64bde4261bea2a10 SHA-256: 6a6027872e58660dbc23b41506536c1b19f6dd71f6552175a24b546528c59702
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature, with the embedded JavaScript likely serving to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=converter+word+to+pdf+online+2 PDF link annotation
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ec78c9ce1c2f81403660bd9f062bb9f9/40656073801.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/74ca00fca6ae43a4ec5a58d2d56f793c/retezizapudamuzamo.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/42327721993.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/juluvapel.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/20463296660.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/91660218353.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/tuburoxolusi.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/dulibolowugefimeguje.pdfIn PDF document text
    • https://fuoriscena.eu/file/9537386281.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a080da0719f32051649b17820c35baf3/4750036761.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/r09d9s2dm8jsnbdlt5otk2mq1m/95226066228.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/77920713728.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6a625da10---vuxupodirano.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/gafibiwasovowovigakike.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/6c5ece87b0aeeb87b5e27bc47204942a/70343996819.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/lazagomabuvaxog.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/67992439864.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/4230885242.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b5e7a8387fec8c47f866dfa9d7791aea/32490084949.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/lokekegis.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841f1fe6fa9---23384520116.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97c533877---80092240069.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/7dd44beb9b49fc7d349bea0fd1448966/15911040940.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/b6d490b31c36517c7572dba3eabdf94d/25114466234.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4609909f7e5d892aa32be0b5093327cf/96217815043.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_off0000cca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 10464 bytes
SHA-256: e3d175d71acb190423935a69c7cb20c9ece3aeec44275c02cba502b1a9c537b8
font_02_sfnt_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 17140 bytes
SHA-256: f53558abd4825b133c2e85e773911b07b7b5b5b5fea682806ccfa96c9c069b2c