Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1a07e7c6618a62…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 00:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a65b3e78d1a23da5ba938b5cbacb2261 SHA-1: 1cab0c68a98c9a982cbbb3138d534c693c2a251b SHA-256: eb1a07e7c6618a62d2562ad67b9e4c1c59bd51be1a8c82ea656d7ee443aac2a2
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm that redirects to multiple domains, some of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. Embedded JavaScript streams were also detected, which could be used to further obfuscate the redirection or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://wronba.com/uploads/wysiwyg/file/68059835027.pdf In PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae4fa0900---73823869713.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/perinamun.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/kibisef.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/5ba0cf35a0dee4b2f0d395da834c8d6d/87119235582.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/puxelixu.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/58546147731.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/13462133004.pdfIn PDF document text
    • http://lactopad.com/uploads/files/sarowuvatosetofulenuwup.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/84625521200.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/tuxevuvaz.pdfIn PDF document text
    • http://groupkaishan.com/d/files/58227934185.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/juzejegimugu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132b07587c5d---77677029673.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/3450055312.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/58579365130.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa8ca164e---tasemenega.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109071301431703.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a6e1a4b86---25855573040.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/83847048200.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/gojapufefivabilaxomej.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/5571933031.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210902_9A194901B924E69A.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/vulimuxufivokigurupeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=add+android+auto+to+home+screenPDF 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_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 18096 bytes
SHA-256: f070115ec59342a75e1328a722d622bb8cb3dc3f13b3f1901dcad5e2a51fb01c
font_02_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 10672 bytes
SHA-256: b1d205620962f94e288d7cffbfc23c7bb093a1c314fee32d0f7a44db18d1105d

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