Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fe6e9f23dcc39e…

MALICIOUS

PDF

81.6 KB Created: 2021-08-17 12:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 521dd458608f27169a2fae600713e8e8 SHA-1: 0d12689982a0bf974f1d79e2575427ac34948806 SHA-256: b5fe6e9f23dcc39e8bfac396a9b7b1cbe0166069ad78464c30f0b02fd1ac26ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the PDF structure suggest an attempt to distribute malware or conduct phishing by luring users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://eltdb.com/UserFiles/files/99107184402.pdf In PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/bdea98574dd8e2a4fa055a63d3258a52/mixanafijamudedamixafak.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/23454357907.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/83494573955.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c26b7323a---56694975162.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/sadakijexavitelefazujifaf.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/jozudad.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/43014744812.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/12224176a0e14331659d2429bcd1d540/57987177969.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/53078430726.pdfIn PDF document text
    • http://alkanboya.com/files/file///vimumodupanasap.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd94a7e9c7---fajagimotugajabavaso.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082117e9b4b5---42776599397.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0e39e9695---naragigom.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/e3bf59c3b4508d008704513fcf553cbf/veloxaronagemigunex.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/84280731375.pdfIn PDF document text
    • http://wsm.hk/images/files/pogowugakado.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a0a6e147b---91797150120.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609436a5eb2ee---88826272881.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/02a09b72452caf489f7dfc56c17e17af/44671191572.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abc972bb068---89896072213.pdfIn PDF document text
    • http://carszana.com/image/upload/File/zuxawegegaworava.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89619f381---67358181161.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/nezojonowig.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gilegoratagak.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bbafdb9ed220e15273e6e1f16450abe8/13640170616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=harry+potter+5+pel%C3%ADcula+completa+en+espa%C3%B1ol+youtubePDF 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_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 11192 bytes
SHA-256: 060d1b4e95d6fbeb6a2f6203ab254263b0a9e1aa71bf162595158cf64767d171
font_01_sfnt_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 16892 bytes
SHA-256: d4b79f718d57907dc5eeb84994884b7c042bd29d3fa43b5fed25bb326a9e79ee
font_02_sfnt_off00011d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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