Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2773a1435481350…

MALICIOUS

PDF

89.4 KB Created: 2021-08-09 03:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38540e960272631c6cc83f97c82d96a3 SHA-1: 965db2f2a54ea6ba3908aad165f975d892447f18 SHA-256: e2773a1435481350af3942d68b64949c1113b2d1015978587fedc0b35cb48329
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to prompt the user to install a browser extension or update. While no scripts were directly extracted, the nature of the lure suggests potential for JavaScript execution to facilitate further malicious activity, such as credential harvesting or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://checopharma.com/upload/files/53267762508.pdf In PDF document text
    • http://chaitraglaze.com/uploads/nukapavijowiso.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/30848259721.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/44246115763.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072e21a72b94---21219827257.pdfIn PDF document text
    • http://bacviettech.vn/userfiles/file/66535553900.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/torovezejike.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/162fcb4074eab2345b1342ed64878068/nomefupewawa.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c7d5bfcb7c8742f2feb4df87d9869083/95471627317.pdfIn PDF document text
    • https://termoformat.md/img/files/74455237517.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f52339158e4---99461310586.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/78558250996.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/nixuwezuxilubuled.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/sawumi.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/6db0ce40b5d7f691d8ce8e568a54be53/jijujafaromejo.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/22771015812.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i3iqat7gg5vum5es3rfe63odom/15224480285.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922538107b3---18704864280.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/f7ff35trtqq77q8cgbn06tvcn5/48312595720.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/xupudejo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f8283ea99a8---nilajan.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103b64e49a1f---doledulotasuludivu.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/bnvcs1k6b18c64v5mrq9u3ncn7/43546327298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=does+amazon+prime+give+you+free+twitch+primePDF link annotation
    • 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_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 11308 bytes
SHA-256: c59690686c804f05ac118c5e9bc82fb858ad75b255057b460b1f517bc6582c97
font_01_sfnt_off0001102e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12840 17092 bytes
SHA-256: 3d1e5f16e93ace5d05268844feddd93d7b99b09766de09b7ec2fb11882b0ce8a

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