Malicious PDF — malware analysis report

Static analysis result for SHA-256 595b52dec392327f…

MALICIOUS

PDF

73.6 KB Created: 2021-09-16 19:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6f4399d4b5be007bf7bca9273563ef4b SHA-1: f20183fff7ff95195796b56e58bb503c95c64c33 SHA-256: 595b52dec392327fda5f47f52413c0935cc7a3c064da9be769021ad3d69b6f5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=shell+shockers+unblocked+66 PDF link annotation
    • http://thietbiantoanttk.com/uploads/files/judofanijufewo.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/daror.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca6e430fba---kepixopikitot.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/jaseze.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/7536854017.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/28637368064.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27b82e49c---putifawozuzivabaxepojuda.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436ed3e6842---vewakabujedawowexidiko.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/cbe2e81e5b758e3162c5f511d897a3fb/61984659845.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/bebakegobuxisodi.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613381d6d4b5d---43363312513.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/50983563665.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/xorizetimoxunomamogoziji.pdfIn PDF document text
    • https://brukspec.pl/upload/file/zetolalebisaguvujib.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613557a45b820---80056031043.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/baxabulopiwa.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/rogenomabadadozoki.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/kurige.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/fovobifipebusazew.pdfIn PDF document text
    • http://findacommodity.com/upload/file/velofivokiwig.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-2/20210902013047194308.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/76743935478.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/xugol.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613543d30ab04---67248830262.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/remavesifakim.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_off0000bdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 16412 bytes
SHA-256: eac3a96a7ba55d9cd07f37d2b643c1c28bdc9568e8108951cd31a493de7e22fa
font_02_sfnt_off0000ffea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 10692 bytes
SHA-256: 5f151ffb34d32fbc4db535adeb9adf0a487c195bb2bcb18fa0fcd02ef84ace19

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