Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b5ae1cf7cefd67…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 23:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35895cac8d011d0dc18cb2118b333661 SHA-1: 8175105de0b9b2d0a6aaa4332441e134d94e7c6b SHA-256: a3b5ae1cf7cefd6764b6a552098117e7e4ce877e777a6b4336afd76d0175a850
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and using UTM parameters, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://wastran.ru/uplcv?utm_term=gerund+and+participle+worksheet+pdf PDF link annotation
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b934ed5a3d0---ditilisupixoronarijatig.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/5866004898.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16103d142dfb52---fonepujebaxevam.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c05678b3e3---xipugokusaru.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd14acd89---99945870806.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b1f911a38---supaxetibadop.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b35308a0a---11719028607.pdfIn PDF document text
    • https://combrooncom.com/contents//files/wezonabogukonolexaberuzuj.pdfIn PDF document text
    • http://vititanon.com/user_img/files/saxawifujewenufenu.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/lqkoa174rpj7pdnmms9pt7l1us/4439478391.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/j7p3nin2q2eha92jkhdrsvv8u3/91774556246.pdfIn PDF document text
    • http://asustainable.com/global/file/sitezodusemu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc10882d32f---fubox.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/57222282111.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/55521729938.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/f613c328886316b1d645616355169c89/supok.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/23349010350.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/luxopukodovuwek.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/sropldl6c12oe4haecq255unla/29883103715.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/12766092782.pdfIn PDF document text
    • http://ledson.ru/upload_picture/sugifuserizovumage.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/arud4lg030rp9gjt58ekf83hkp/bulepatizim.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162242339925.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/51efebce600a076499e61e50df912059/92247997911.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_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 18032 bytes
SHA-256: af7a1986c58c0d093f4a88b2bfd407ef9aefc7631f3a81658076b4eca52f9ab6
font_01_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 11036 bytes
SHA-256: 20d2ccc3a261195df47b64bd3a95b779c49119524c1a73d9df0b28386d1415bd
font_02_sfnt_off00012320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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