Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd1f1c6cef6b529…

MALICIOUS

PDF

74.0 KB Created: 2021-09-02 07:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 725f50546f4ac07767dc011ab81e55d0 SHA-1: 5e0b231cb4268dce74398a44387e55682ade76ca SHA-256: cbd1f1c6cef6b5293bb32843ca15ea7d986da4fe3dbd8d815f8841bb49989c61
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous potentially compromised websites, many of which host PDF files, suggesting an attempt to distribute further malicious content or phish for credentials. The presence of a visual download button lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dienlanhbachkhoa.info/upload/files/sabatudajasigazu.pdf In PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9fff011b---56164925505.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/39227467316.pdfIn PDF document text
    • https://mfdesign.hu/files/file/tojijakadu.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/9669828541.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c0137e190---58863107663.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/31577660435.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/gajutise.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984b0fcbd75---kumajuka.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092452e29a49---rifibona.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/sazakuwopitov.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104a1fa422e6---teneni.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/verasikojajavinokiwabi.pdfIn PDF document text
    • http://dhf-china.com/d/files/96000243579.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/65241840268.pdfIn PDF document text
    • http://bdn10.cz/files/file/88781731847.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/mawusapaf.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/zetonasudetop.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/dafebo.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d316a61a7c---92120844135.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/23498348998.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/tuzowofuwu.pdfIn PDF document text
    • https://ntc-container.com/upload/files/86711686098.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c5de8a8430cfc2b7594c2144a5e87fd6/78105959157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=future+high+off+life+zip+file+downloadPDF 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_off0000beae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAE 10832 bytes
SHA-256: d8bd353644d3a53655e8029ed8bbe6f23de63a6911b1c42638659f6e55327061
font_01_sfnt_off0000d76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 16496 bytes
SHA-256: 692bcfa154ca4ebddec33a1d030cedaa1cd78fcbb3df03d8990ff6f199e5d658
font_02_sfnt_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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