Malicious PDF — malware analysis report

Static analysis result for SHA-256 d785d8b0b72a861a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 12:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f7c8c11418e5d7e979865f8b040fea81 SHA-1: 655b17f63c8eeebb486e4d632eaf6d21b3994ae3 SHA-256: d785d8b0b72a861a235873777ec40f2341293ce5b3425b112104a362917b008a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous websites, many of which appear to be compromised CMS uploads. The document also includes a QR code lure, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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
  • 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://infrive.ru/uplcv?utm_term=qr+code+generator+without+password PDF link annotation
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fd067208a---komubilakodit.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/95059342735.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/regalipeno.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/92693028323.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/29845316758.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/35038341039.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/95517000554.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78431734393.pdfIn PDF document text
    • http://lscapital.it/images/file/rujisozinabopamelu.pdfIn PDF document text
    • https://vgcanada.com/userfiles/file/20283141225.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/xaxevovitamuz.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/tojitaxolokumagapusi.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/60386761159.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92143607195.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144722a69953---62121555456.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/25065706729.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/56d0146dcd5b32b664e3a43b626b6028/75029590762.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/kisamoxex.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae63436229---wuvetuwupepisamiziti.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb78c04b8c---41682985207.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091718514173.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/midolopewuniwupe.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/jorokivazojomok.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3c2d5fe9---8710149977.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_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 10992 bytes
SHA-256: c2ac07b7752988dccc92042fac2f81e168ed45fe2859ada0b3de99552ffd8d6e
font_01_sfnt_off0000fe1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 17808 bytes
SHA-256: 3fe50efe273b93896f1114b91b1bba3ff5a401651231cb16aadd7584478d13c8
font_02_sfnt_off00012cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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