Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eaa1d78f8d4a647…

MALICIOUS

PDF

98.2 KB Created: 2021-09-07 05:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e19d75a63fb5cb1bbb93a4ba9f8d6fa2 SHA-1: 200935ac9b58289b21b2bb1847cedd28af23f47c SHA-256: 3eaa1d78f8d4a647ab7e56a5d58acee1a4aadb601de687d722ba0d0e7d1e13f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of embedded JavaScript, though not fully detailed, suggests potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=main+idea+and+supporting+details+worksheets+for+5th+grade PDF link annotation
    • http://apartmaji-zunicmile.com/uporabnik/file/vokidajifa.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c435b68ab56---mogojotefututapar.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/81776958577.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c08a5323---1388151913.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/jeluveb.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfed409525---vijukoxiretex.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/s9nr2atjgkq9p3l7pkpri6c587/74349540301.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16136ae3527f05---97798441665.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080bed78d29b---kulagu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16109425abab1e---43257508609.pdfIn PDF document text
    • http://donghotam.com/luutru/files/doxomibugisimelutujuro.pdfIn PDF document text
    • https://conrays.ru/f/data/27407095109.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/42500387078.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/ead1ce7e4e921277dec147677b5f12ff/74679674355.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/nezorigajigugagadejex.pdfIn PDF document text
    • http://rockoncharters.net/home/rock/public_html/ckfinder/userfiles/files/vorasunu.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/famujofosotagaxojosiforim.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c17cc8d2c8---xaresowexidukomus.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/milajetuxadekeduxodidobox.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/22852995163.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9100454bcd0a8016fb6c63420d71293d/83503284332.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/978d438d3b560ea6d895a81eb7d19aaf/wofevemodesuku.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/132600703160a656f8d3fc8.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_off00011809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13020 11180 bytes
SHA-256: b6f833cd623602cb8090c4197decce2adc4cba978c24a7172e4c2326db313f1b
font_02_sfnt_off00014a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A14 18704 bytes
SHA-256: 5997bff8585cdfa4d513a924228486a8f44aced3145e9745798c99186634be20

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