Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e491d3b987ee8a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 06:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbc83018279b7342bbd012ae5598c932 SHA-1: bca453d9790efe6835f9c7017928e1da51b9856f SHA-256: 18e491d3b987ee8a108f030613ffb1c7de9c84dc246ebf3b72b805301e075ec6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of many external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ngonluathan.com/images/ckeditor/files/pavowejoramogenadelive.pdf In PDF document text
    • http://systemsbiology.at/uploads/assets/file/gevizidevo.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/18439529786.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a9d23c82a---zopanu.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/lezuga.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/6016848433.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161186466c5890---27030756240.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/57960245465.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/76727597400.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e409d6bbc---49644974951.pdfIn PDF document text
    • https://digireg.sk/upload/8725408011.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/367feb8bb2893b4380c16b87a1c7f7e0/tubozepijarivuzolikaxur.pdfIn PDF document text
    • https://ebooksweb.net/files/file/bujizu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e2530bb3d3---90838996361.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb29aabfe5---boxegagakuribukigefaxe.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/v1jjnf3otv69iu3qjd7fnmjg2u/fudenuwixozeg.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/612091beda49ba18b229cb0c7925a6cc/42431856344.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9627c5adde97bf461a1095b1d957460a/mexaxajifasebi.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3067cd86---vuvaf.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/90527079029.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/anldtl07q2uscqn3oi56pg4tpr/dibixogavuxerediwosod.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/80869595294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=jaguar+xj6+manual+for+salePDF 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_off0000bac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC9 16820 bytes
SHA-256: 30ce162f5fb61060b4f0abc4708654e4dab2f8edc48e48a582cab4b7cd6a262f
font_01_sfnt_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 10856 bytes
SHA-256: 6ca98a4b35ad17d0374e7f465371ad520c3ecdd5b86d61189aaa894df0813bb9

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