Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb3d5db849d964a…

MALICIOUS

PDF

91.4 KB Created: 2021-07-25 23:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a97fbffe0ea2f23fed8c5e51a1adcdb SHA-1: 44c31fc9acf40f3e4d9197af1740503af3f3f5fa SHA-256: 4cb3d5db849d964ac8be073ec435935b31d24eafc184a27330b81d03226f8147
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and IP addresses, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/a30dm1lb85aojdfevq2iu0nf61/zuwisasaxeb.pdf In PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4d524763f---detimapobin.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/gipur.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/nanojasizoxelobisofem.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/43488737661.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/migezosijoximakuro.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/taxuboxenavaxabupolaron.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/373b5803195652d90496617479da0e2f/xegasoperatoxipo.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/8ae0eb7f03ae00a146b148c8c6cde0b7/dikoxogatekotomu.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/tedafagodagezonaj.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b0ebb4a6ce54e1a9fcfd660925fbb617/vitemepudederuzuxidogus.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/91177889445.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/19265045101.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f8a304f9---12364150143.pdfPDF link annotation
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ubp4119rg7o1nebfni5h4tr647/sofelapegowuzekip.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/4uimq8iotb1bogfqc5fkjpuje7/buxedanuwumunedigupivajew.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1aeaadb34fddb327e9e610c8cd35406c/tawobeledogo.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/75922474807.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5502cde6a---82756753304.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/57922746136.pdfIn PDF document text
    • http://prota.ru/upload/files/17502223540.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1496d31dad---99832563104.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/46657423203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sinonimos+y+antonimos+de+palabras+comunesPDF 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_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 11104 bytes
SHA-256: 78b1889ad46f8ecb7781b934edeee384f71d8486f419b5d65c700744cf25be8d
font_01_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 18648 bytes
SHA-256: 26b7f2a2f1fb7379d424cc78e217fdcd332df275cb562b769b42f61363d65611
font_02_sfnt_off000148ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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