Malicious PDF — malware analysis report

Static analysis result for SHA-256 da68b381a443247c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 08:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 223c8e085b0eaeb2149d10e97ba78458 SHA-1: 293d217e5395f4ad9f9a71c3bc9d60f86afa4a6a SHA-256: da68b381a443247cdea5a23e1003c7e9bf3450da82c730c2fa79acbb658f2567
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://banglatalkies.com/dynamic-images/cms/file/54760917214.pdf In PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9efe0873a7---8754550876.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/2pfhmjv1rfo1mapfvpo4k6nbii/lolix.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/kovezowavoko.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/3b7004cc144a97d5d0dfce148ee61ebc/xowef.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/46585484684.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/sk0u6q49ve1356b4k6b59m62es/23104010994.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8200137a---didex.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/89dea8a4eb533274c3ce5d4af041cb5a/texazebumakusonuda.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/padil.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8q5t34dhq3ik1vvk0vib4aeq3h/95352943469.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/39205921823.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/rdpdkdnkaqfgk03jo4ijcqgkje/fivogufibesudux.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/21877464449.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60E56E40D0AF1.pdfIn PDF document text
    • https://digireg.es/upload/3442383508.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/sinij.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/10438113991.pdfIn PDF document text
    • http://markone-tools.com/upload/files/javonategixafogig.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/kibumure.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/lotamugibumanokarawerew.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0f022eea2---dunebikefufilewawisozon.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/59664962237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=analysis+of+data+using+excel+pdfPDF 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_off0000e07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 17228 bytes
SHA-256: 1111d2d79c280e1ad48344a568b65b4e61583c648c3bbc6c047fe720a9dc96bc
font_01_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 10992 bytes
SHA-256: 0a956bde6c2439603c6322be7788eb7b863baaaa782fe20859de68c0b87a03b0
font_02_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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