Malicious PDF — malware analysis report

Static analysis result for SHA-256 eadac703945e215c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 16:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71d05b2862b597110a3c9aa2cbb1ac19 SHA-1: d609561a61101a123ffb398a8ff77be4c4b5c185 SHA-256: eadac703945e215c720e7954854c68bf066088be371cbaa2ad0ca96b100c815d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://chcial.ru/uplcv?utm_term=patisambhidamagga+english+pdf PDF link annotation
    • http://dentherapia.hu/files/file/75680723001.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/1ou04l7tlsrqh9408o8ear2cll/59874072290.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021620442579643.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e6f8091fcf1b018c12ff974d6a85e8b2/28705730544.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/41978791700.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c518fe332a---votusonugatik.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/45198436396.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa60d6f850---dibufuxubojoragiso.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2218bf2c1---wopekewedopukak.pdfIn PDF document text
    • https://codecs.ro/images/file/38867906198.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ff9a99713b576357f8f3fdafe9b70a75/82730045460.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d23ed536dd9---gaxolofimagatipo.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/buvekebuzobomutupisijug.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/toxesesuviwagubifej.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/88239520761.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/45926805465.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/21928200310.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/13189571430.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8604c2e7---belanumiwuka.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/16138582120.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607592e9412f5---zatibonozoraxunojazevotu.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/piwoketikurevirixu.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_off0000c158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 10864 bytes
SHA-256: 2e608909fa41c1b6e7ef67843a4fa4df8d0be02c8c018f686eca8c6d25f1b0b1
font_02_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 18296 bytes
SHA-256: 5636e13f568186cc56cc27dd99735dbf11e9744bd66bb334672f202b12f3a28d

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