Malicious PDF — malware analysis report

Static analysis result for SHA-256 38588befef4ccef4…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 19:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02de9e8e16057fd9a9754a45bfb96bb7 SHA-1: 1238b8c0ea4bb9cbc90c675fb85c3e02bea89d58 SHA-256: 38588befef4ccef4da177119fdb2d9c2eb7fc76268a0f545299032e40d2464bd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on potentially compromised websites, designed to trick users into downloading further malicious content. The presence of a QR code lure and urgency language suggests a phishing attempt. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://muratay.nl/userfiles/file/42049064060.pdf In PDF document text
    • http://yushendesign.com/images_fck/file/1631541623.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/nijabaxo.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/81567109397.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/81419126474.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/foxuxan.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/kurijukonamabedutasi.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/36282221977.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/68183783740.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7b5ef8f3---98749176149.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/559f6025jmob6ebsn6vugkpt70/simusoreziri.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/dusilisivimalogeku.pdfIn PDF document text
    • https://jck.ro/userfiles/file/43198839780.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebdc2ba7db---89209030185.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090406275692.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/32726145651.pdfIn PDF document text
    • http://speckrepej.com/upload/file/geworopuwigowodesusibawi.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/65436723236.pdfIn PDF document text
    • http://receptlap.hu/files/pivozedupej.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/13058440091.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/76175765259.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mevesevotenopaxuma.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/vosaxobolazi.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/16700272176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=qr+scanner+app+windows+10PDF 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_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 19548 bytes
SHA-256: 92b832ca8fd5f9d5d2c9b94ed8e0154d822d3be516dbffbfde3dcd89f98ae20f
font_01_sfnt_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 10684 bytes
SHA-256: 3147f45cd7de581344b760ae5d3f9eff09f91cef125123da44e49e0dacf41ce0
font_02_sfnt_off000129b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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