Malicious PDF — malware analysis report

Static analysis result for SHA-256 46735d195fc9df1f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-20 06:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3ab03a47d07ed945a92aea5a7f40505 SHA-1: 11bd4b2558c84405c0e7e3dd11788ab947034f41 SHA-256: 46735d195fc9df1fe91ea03f629f2ae68d2583aed74ee44b9123108d2962c2a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads and disposable hosting, suggesting a distribution mechanism for malicious content or SEO manipulation. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bbu.vn/Images_upload/files/gotadogurasirit.pdf In PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/gafajuguja.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe8af0667a---94645991121.pdfIn PDF document text
    • https://equalland.com/uploads/File/81001177893.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/fiwifajanupulokadatakov.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/morosa.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/dinuxosibulutarawerabarun.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/kulunixilog.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/lafaxozuxe.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/93032474690.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/pejanomupav.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/vararitixoguvavomaw.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/60214337469.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/20960235869.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16141d54e347d0---zejaxomedaxobabunu.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/90162317374.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/76510761812.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/misunoxarofabifada.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/65665559978.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/wabifapijog.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/iq9cfgosc65d9p02m26ochr6ec/tereseto.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210919_1BBC4356C46A4825.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/6298252231.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fotefofinug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sunny+leone+beautiful+sexyPDF 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_off0000b5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C1 17648 bytes
SHA-256: 2ca979b7464c3fda1778cce4edbd6d39fa0490eabee5941cfa3c0457efb07767
font_01_sfnt_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 10640 bytes
SHA-256: 7034dc1ba3aa5fa5dbcec4aa3f22a0c10ee3e14469768677c457139c55831da1
font_02_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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