Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1656b5e8b796648…

MALICIOUS

PDF

95.8 KB Created: 2021-09-01 20:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1dd4d69a76cec51426dac3996d2814bf SHA-1: 3b241ffadaae6237862784cb2be8fcb40cbe4de4 SHA-256: d1656b5e8b79664867bfb32981df423ef833886a756dffcdd2caa3e3417e8d53
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other potentially malicious sites, indicating a link farm designed to lead users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://eatorhours.org/e-bussiness/fckimages/file/15346604004.pdf In PDF document text
    • http://markone-tools.com/upload/files/92125530274.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/qctknv547scgkq8b39a3kg1qfb/lavafozojezejamedufam.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/simokonanad.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/mebovakulimakuduxigur.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d40ddde6---5647223161.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/30245181345.pdfIn PDF document text
    • https://nada70.org/userfiles/file/vivisuxodowe.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/34779724046.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160899d61a47ec---79236387492.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/witupa.pdfIn PDF document text
    • http://enricobarraco.com/files/52086667811.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/34473714287.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c208aaed32e---54238019723.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/54357428264.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/89990950504.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096baebb5f0c---36948834143.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/51303718119.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/ae1fea88bb633be6995989aac0d307d3/56665008217.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/47c834eb1e967ee81cf0730a0a9c9bfa/sufogo.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/30997121748.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/kaladojajubesosalujo.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/faseralirugexizarobir.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46a35fc37---tewesowusawagupakereme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=i+really+enjoy+stories+that+are+in+the+distant+futurePDF 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_off00010eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB6 18712 bytes
SHA-256: 83fd656bcc48362baa05ee4ae642b8fd569cf3a0bdc537cb706d15edd2c379be
font_01_sfnt_off00013f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15733 10748 bytes
SHA-256: 25908f19e7d20c1984d2655fbc57c837ee544667a84700a66ad8df93e638714c

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