Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4a97e31abfafe6…

MALICIOUS

PDF

70.5 KB Created: 2021-07-08 02:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f19c6c20e66398a40929d09fe2f45edd SHA-1: b741e10ac11e948980d5b0d8831f2a8545cd2f95 SHA-256: ee4a97e31abfafe6f9f04081c9ba67d0340e549236be441c8a88ef0f16e973f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=different+ac+and+dc PDF link annotation
    • http://ghioroiu.ro/sites/default/files/file/83415185628.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6f78ceb55199e35af261ef08d68a91e7/zotabeze.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03863a45a8---napaxuvexojejo.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/197mkiejbmltg2kq7180ga2qlq/dasoxubonawukide.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b13f3bdfec54d8430025321b7f53fa23/dakobimoximujitukonatuzix.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/im9f9uvrif904otqlhud7si7s7/jumijurutupigoza.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6f92f97d0b2e81072c31cd2d6325a259/todilagesuz.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/jabivorovufegi.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/50611499666.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a652ea7ea02---sutaxojuxul.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/5bd85eda6bed6685aa276089d03fcdc1/1054899388.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/12817018132.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/11717273272.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/56970662193.pdfIn PDF document text
    • http://mvpvo.ru/userfiles/file/83705357880.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070806ab6e00---55007980589.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d84e3dbe4bab8d4a549fc9135978306b/47298976654.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f3be1e505aede78a87ee7c31f0020972/zifabamilusaju.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/50375423407.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/pevitigusutajekuvimefokok.pdfIn PDF document text
    • https://clinicscrm.com/img/files/86452939455.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_off0000b7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A4 10136 bytes
SHA-256: 98066dd0d0d44193ffc460adc774d29fc5de51538c86bf2e52db17bc1253b3e4
font_01_sfnt_off0000ce65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 15144 bytes
SHA-256: 2a91989bf4459976e17191a5dbb0e6c068f3648c85bc523725375d4ac81c96c2
font_02_sfnt_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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