Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d08b66b0e23da7b…

MALICIOUS

PDF

100.7 KB Created: 2021-07-13 17:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 459d000b6b8faa104f74a4fb9cc02791 SHA-1: 939d9fc5583daff081bb188e36711bb0a7c0b4a1 SHA-256: 2d08b66b0e23da7b8d357ac8d982d2b9415376ac4eaef2c4f5682adb0996c228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised WordPress upload locations and disposable hosting sites. While no scripts were explicitly extracted, the nature of the link farm suggests the PDF is intended to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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 http://woods-china.cn/ci2/userfiles/files/20210709184908.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b78b54e0fb0---96078137294.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/oo06o3fdo4sdnibsdees06u96t/89316681038.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/3299ef7c0b8951851cfb5aec6590d824/pozelefepanavoxazuxopej.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210516/2105160429439293809zdcd0f15lzg.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/4787327ba96e1249cc5320c94f18346b/6042767411.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/palifokiwigonexutiluzumir.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/luteveravunijatixibupimu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bddad36e7c0---juzewovebimubipisadin.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/65520849213.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/692b923f33a903cc5189baf8bd40326a/dogadorajakutopagapekig.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1f347d542---sokujesozegul.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/10rh7vgh7879i1ruf6984fba99/lojigupibitegurekuf.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d53fce8f6c---54173641135.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/82123e107337adb24af56b19ff706d1c/sidejujaberone.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/5vtk19e6llic9cjccv18gcp6g4/gupigupesitasutejiro.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/wefibesufakufeta.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/jhco28s7s3gqdu3ba7qe5p9qsf/29618695833.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088979bd519e---telifetazevijimuvedufovej.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/juvafebusagewuse.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/99269341455.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/2e19f2450c87da0ddb3abe5775daee1f/16590083876.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160de2a4b8f1be---42208446440.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210610072446_rzb0fz.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/o6g4p9ft6uhlmcsq3n0npsefbd/74638894654.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/faleragebikera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hawk+with+barred+tailPDF 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_off000127f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F2 17056 bytes
SHA-256: 2350012b4d2af5821e410fcfb45a09b19b330a62d056d558534807fc10e381f1
font_01_sfnt_off000154b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B4 10264 bytes
SHA-256: 53b2fa8863b2419edf4ba3ab4ea0e508b839a666e1356c4e64fba301bd721282
font_02_sfnt_off00016be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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