Malicious PDF — malware analysis report

Static analysis result for SHA-256 5575f65b1ed32163…

MALICIOUS

PDF

80.3 KB Created: 2021-08-31 09:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6865963d92c8106d16935bccbd86c16 SHA-1: 186d9a1942b3d0edf4325dfa5766e24c89ae8a43 SHA-256: 5575f65b1ed32163d4716af49c18a0430be304d211ec8b8d8d2f411aa6a37911
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites hosting PDF files. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to download further malicious content from these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce59543e174---86303428052.pdf In PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6cb76ef5a82762b4b6250e2b6ab80d0e/menamerufebef.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb8a77a47---rekipi.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/3108570376.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210821114526.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ab1071780---fomijasatan.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/gifojiwaj.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c93ab905---23687667031.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2e3594ef---49184124610.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/finisiwedo.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/11721032657.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72aee1ed6---tulipanatubuvun.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d247fe7d662---rivuxiluvisoduruxugu.pdfIn PDF document text
    • http://cudicio.it/images/file/turuvawegononejaxapigavo.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/tupekelumepunujuvo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c7148aa931a---17954912875.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71278756434.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/dipuwepowaduz.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/rv5m9928fercjd6tq9jtmsbsn8/toxedezipuwatix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=communication+in+business+context+pdf+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 16888 bytes
SHA-256: 02b25eb9104aa1f3957a2df01bc86ddfb9384904c6f716d924ef3b4b75fdbd81
font_01_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 11140 bytes
SHA-256: 12245ca7a4394dc173c978c2df08f0b24fc8ef8aa5fde851e2899bbdfbf803bc

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