Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40d232ecb6a69fd…

MALICIOUS

PDF

78.9 KB Created: 2021-06-12 11:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbd579bdd98d4b12cd55f444728ac457 SHA-1: 500f93058d5930dffebdc1689904c974ef37773a SHA-256: e40d232ecb6a69fd530c1569c1b43cef1a1569a17931f13556dcb5f6c05a16e8
164 Risk Score

Malware Insights

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

The PDF file contains numerous links to external resources, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' lure and the ML classifier's high confidence score further support this assessment. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=bengali+new+movie+free+download
    • http://kaies.cn/upfiles/file/14631698936.pdf
    • http://casier-a-bouteilles.fr/file/lojidutuzixu.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160757484406fc---dejalixinoragixokivibi.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb804d8dfd0---79406334824.pdf
    • http://uniroll.pl/user_images/file/bevegesomozajabevikaguji.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210518/file/16212796825917.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/fg93ka8adbb9ongcs73d8cmt56/jurivaperitowogefulupivi.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a76515c6514---24278848537.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c1c9daa8c---nimujewupipoji.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16074f8d2456cd---49880530308.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/romos.pdf
    • https://cowichanseniors.ca/userfiles/file/xuvibawet.pdf
    • http://richmediahouse.com/admin/uploads/file/wilosi.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/23613094901.pdf
    • https://dodomacnosti.net/data/file/ripugunepuxusipevudatisol.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d690655d4dd54493298fd41b5943e80d/falisogagugifo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4e.bin
f31e620319b229fc6fec0e5dae72a9cc1b8bf7aac5504e4896a8cde3a9e05bde
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 4960 bytes
font_01_sfnt_off0000fc21.bin
9165d1f4f37ced8229f409f835d103a6c6ad1f3a52ebda49a3001603da655ac9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 10492 bytes
font_02_sfnt_off00011fe8.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 4324 bytes