Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd77d32e3e2e323…

MALICIOUS

PDF

93.5 KB Created: 2021-07-01 15:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 44bb660e94edfbc500ff911ae5cfb63a SHA-1: 9065565e1f81039030249ea9447062d0037dd3e7 SHA-256: 2fd77d32e3e2e3231e2f39a87cc583f8b647118aaf03ef79fddaa9ae06907232
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/6a5b7164f328d7b264fd5b735f9bf252/xamafuvuvabisob.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/669n2nua5fks9njra2bcgojal5/dumofufapanut.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b1fda5dd01504d074cf06deac7dde995/kitosi.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/fixezojokozefatama.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/78247219557.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/18136774813.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9700dacc88df0485c3e0d56265e5996a/benexufonulenulawupivik.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6c6cfb7349ba5ad2c7b362e8456b9dab/12776596913.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/90713696766.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba97f137114---33457739558.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/wanofexozuvunopivegape.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073004d2c0db---fegaxadik.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/96238019632.pdfIn PDF document text
    • https://samtee.com/admin/images/file/29043826951.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9ea09f9e7---65775901015.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/af774b1e9c948cfc8900a23886ea3519/lutenokatapelowuvaju.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/61ec846d66cc31f0181af5f1a061feab/bijijinajekaxefixux.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/xeziniwaxemizibaxoxepu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a056c97b2af---rijalasujane.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728b07dff1b---nigojenanomoxudekekizitu.pdfIn PDF document text
    • http://kaies.cn/upfiles/210523205107150638t917bs.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/woxafugivimusezi.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd054bfb60---62873719935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=black+ops+4+classified+shield+partsPDF 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_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C1 10836 bytes
SHA-256: de0c8beadbb071687872f576f83a5d8b46ab132ede521c4d6ae4475f221109d3
font_02_sfnt_off00013df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF7 16628 bytes
SHA-256: 906b9793708cff9a85929d232dff6f2546203ef53b37f3f9438896fa019219b1

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