Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41709c047f0b243…

MALICIOUS

PDF

87.1 KB Created: 2021-08-24 12:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0146860d4498106dc075c68dd0bd6e1d SHA-1: 8010e91690ebd4929b46f477bb5b97547882aa73 SHA-256: c41709c047f0b243ef191479e31f4666fb0835b54a5b39fe48845ef3e7070141
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains a high number of links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hantverkarenisandby.se/UserFiles/files/sivigosedojabexinaviw.pdf In PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/cc2d7e66f1f19743865970dd4787b149/dulumerupejilegopiw.pdfIn PDF document text
    • https://ocw.tw/uploads/files/dejalaforavo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0efe28d22---pirerel.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bff9b41d591---bawewifekawifa.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1623933800.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608043713df0e---69373663129.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/taribunivu.pdfIn PDF document text
    • http://24cvety.ru/upload/files/95216908136.pdfIn PDF document text
    • https://webmenuplus.com/images/file/sulanaxi.pdfIn PDF document text
    • https://mollis.rs//files/32172466067.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/16052276988.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96fe89fd6---75959581564.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c2d7ee33f---97152713397.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/53899191436.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/86954968449.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7899a223fb---feramutixelotiwinimere.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/39597823673.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/99530885550.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160f8201a5586e---perudababonobonokakulexir.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736ecaacca3---natezopafogafigafewe.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/45012513345.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/14090908807.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/2128677532.pdfIn PDF document text
    • http://theultimatemarketingsystem.com/survey/userfiles/files/97707817997.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/059dnco0orpsfruqdrthc6vcv3/69821841013.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/nejobunulojifitanukidexon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+break+pdf+page+wisePDF 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_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 10832 bytes
SHA-256: a3679f3f03487e208a8da506c907f5a3130c64182522d30a44464d9d1dd93a78
font_02_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 17460 bytes
SHA-256: 3ec5b56e3331162cb596189c856488c7656c3d320c4afc0b28815b288189b28a

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