Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1598511b18896a3…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 08:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3e415eb9c9054cca9a6830e39c9f0b9 SHA-1: 263fb68112846fb535aa845ab8a16749669dc3f1 SHA-256: b1598511b18896a3857d2a68f09188b624422d0258e6ab647d31aade2950a9c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to potentially compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to host phishing content or distribute further malware. The document body is heavily obfuscated and unreadable, but the heuristic firings and URL analysis reveal a pattern of link farming designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160898832d7505---xupomigi.pdf In PDF document text
    • http://valeneighbors.com/userimages/zojolozabafuxuv.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/23031641812.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/97828765817.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094016f4bb6d.pdfIn PDF document text
    • http://scarpatti.com/files/19063463716.pdfIn PDF document text
    • http://teraval.cz/res/file/29207920941.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d6a17ecdc---miwijabelusasin.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/48457463959.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7a148ffeee83739c1b544e1fa998d4eb/45079211534.pdfIn PDF document text
    • https://zzhqhi.com/d/files/xupelaru.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/10335853595.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607482e2f38b9---78580730111.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/diwutedosunigumolexof.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210825013056.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a99cf7ba27---nigosituzixegol.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/denuzewugorovimuwedemobi.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/judibapemeden.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/35384169442.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107c43fdcf24---82431336351.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/xovukidutavuxapowepox.pdfIn PDF document text
    • https://aashianarealty.com/file/95457938166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=inventory+system+in+accounting+pdfPDF 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_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 15824 bytes
SHA-256: de9f3ad1d1e306bd7c033fe5495fb8749dec55779e1b73d15d54805750cccad0
font_01_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 11148 bytes
SHA-256: aa8ea1e484e07b9b343038c330de8ddba2e46785853280931e5080a7793b4f42
font_02_sfnt_off00011705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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