Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03d709e4abbf678…

MALICIOUS

PDF

86.9 KB Created: 2021-08-03 10:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 11d2109c5bfd3c9f30840a4e20061570 SHA-1: 2334fc84456b0b388cdbf8c07d571d3c0c3c0b89 SHA-256: f03d709e4abbf678345707fb6f15e43c03cc5cbc15b9b3af02f9a0801b544d14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/uplcv?utm_term=what+to+expect+after+ultrasonic+cavitation PDF link annotation
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102dd6966c2b---70477589654.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/jemoxine.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/can05g86ejn45gfi2tussd0vs3/41666488862.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/51986618375.pdfIn PDF document text
    • https://anakmeong.com/contents//files/23768955906.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161040a22ef055---redaguwosevaxoruberijome.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/mibovitimonabelukafapap.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/nuvapujemaxamexixekujab.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/getuxetiwuvinubomader.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/71728399924.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0af1d6aa4f83316473181b5aaa6754df/gagajugarari.pdfIn PDF document text
    • http://teknis.it/userfiles/files/9037425472.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/pikitot.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867b61a888f---26014499730.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/fugokofiken.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a8bb02d236fa3b5b227bf177c5679c3b/deruzujafategevetoku.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/wixigurukaxodarimekapagos.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/79625890045.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/negefapikimip.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160903c3f39aa3---80813566182.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/83731b105a02ad5dbba82bcca62bec47/votiboli.pdfIn PDF document text
    • http://fteq.ru/files/file/28381509979.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/qnfn2eaedmf2umfkhhf1v26bn0/setove.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_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 10836 bytes
SHA-256: 8c84100a6a3f5c3ae816dfd53ee776e1eb002d7e9b055158b385d070adefccc6
font_02_sfnt_off00012222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 16644 bytes
SHA-256: 2fc4889c9d23b36a129ab7de4a3773b73882ee16e8458d9701473a6945c10c6e

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