Malicious PDF — malware analysis report

Static analysis result for SHA-256 32e7678cd56e7b82…

MALICIOUS

PDF

71.6 KB Created: 2021-09-06 20:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 855ee8504fcb2ed482af2c573b65a475 SHA-1: 4bbd765f4e005deeb56a772a58e26cb40886101a SHA-256: 32e7678cd56e7b829f7c33b5ee64fc23344d1c4d4928d43a5cafab8e331909dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination or leverage compromised infrastructure. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://wastran.ru/uplcv?utm_term=milorad+pavic+pdf PDF link annotation
    • https://jcmimoveis.com/userfiles/file/mufejunuvusokuxej.pdfIn PDF document text
    • http://hephatha100.com/clients/4/45/452f9a9cd3514f90eb92b3b4734a1f1d/File/miwiwezunefexa.pdfIn PDF document text
    • http://erex.hu/upload/file/89602415868.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbe4bf10f---kudere.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d395d1a58---79544753607.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/wokazulij.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/kowelepoboleseje.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/aa7a7ec25a59ab18756786be9c1add18/pisupusukofifowezakiz.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/wojefevujugododozilejis.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160949e08eb443---zorimevepuxateribexi.pdfIn PDF document text
    • https://sealskinz.ru/files/file/18199702564.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/afca1de3a9eef928dbe94273bb491b97/rupuwitobekezadikasufisux.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e8894977e5---20767085911.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/vururexemeda.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5a6663fef---gewefatirolamupoxin.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/41629305131.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/49019877815.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/s2kfqorb2fgvbgo87iulbvj7et/93267278630.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16102caba4138a---85020202514.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/35019995340.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/11107795894def73443780fa502d044c/17130179340.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7761b6d799---gozovud.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/ridabefituwusenede.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_off0000b51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51B 17600 bytes
SHA-256: f4ddc3caa00314537ff7a7aafd572e00eff046be1a8b9813ca07a7ba562adb96
font_01_sfnt_off0000e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 10168 bytes
SHA-256: 9a73bafea57b449d6ed6dad97325fd0feb1f35bfa611f4c1fbbe04976afedb0e

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