Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c636254a70194ad…

MALICIOUS

PDF

89.0 KB Created: 2021-09-23 21:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e716efa9e31ba4484e261360e1dd0306 SHA-1: 1abc073f2acb9ab210cdc95d7ff4ba35a296516b SHA-256: 4c636254a70194ad9f6f4f0b3a33b942770f324a5876a073af8704edc5382e24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure victims to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=mma+manager+game PDF link annotation
    • http://www.bongbansaigon.com/uploads/files/32827080013.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/namiwasususere.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/viguxisatelibix.pdfIn PDF document text
    • https://wecareprogram.org/images/file/jodedovelemabux.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/butunigoroziluvu.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/56511839772.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/9975125656.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614bcb8656ed7---93735249417.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/letatin.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362ebd1de34---98325763919.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/kedujo.pdfIn PDF document text
    • http://dalaichau.com/files/suluxilelevugewajobepulon.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/rapemefilusebatuvapudul.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/sajune.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/45862496618.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/97088361148.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb6859e597---kipegusoxusaxi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f2920abd5545a42b2be7b72baa1ac05d/birudusewogugonixigugoto.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/gokipixe.pdfIn PDF document text
    • https://jobtiara.com/files/files/87886020498.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/mikeji.pdfIn PDF document text
    • http://domexpo.ru/up/file/rodamodiwafoterixido.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/96631642134.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/938155678a4b0b0eaf7f5671d9e0d727/82074642205.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b517a5d28---momolodusumokovesedis.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/lufisadosogavorarodi.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_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 18776 bytes
SHA-256: b0b5a7d5770d456ed4538eb15568dfd9f2d01fdd6f35f53f07bf8b7d3df43c35
font_01_sfnt_off000128a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A1 9920 bytes
SHA-256: f7841ba1db2da607eb3aaaced5b54b1f9f838697314db7b9f10f5198ac4e1404
font_02_sfnt_off00013e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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