Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2395d4a17cc63e9…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 09:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5152da8c4852652c24cf643ea944c02f SHA-1: f44c37257c486c3bd6c5941e959d0c133d5fdd6b SHA-256: f2395d4a17cc63e9085af4b891eea586cc38f585d133326e8777dbb7d8853529
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. 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 0.9917

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://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5161b0542---59370266171.pdf In PDF document text
    • http://pinturasoltra.com/images/slider/files/11044851952.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/83923296959.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/91241034044.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/96953963728.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/34142434540.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5a9e48f0---dopanalojepuvodena.pdfIn PDF document text
    • http://warehousetraining.ie/images/dupafomejor.pdfIn PDF document text
    • http://vln.nl/files/file/talemejewoxovunov.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf9693a10e4e88fb24ef3d06c87d18d8/27896457599.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/4997257478.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/30702416826.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/kedutidifafumebokadizomi.pdfIn PDF document text
    • http://npas.ru/pic/file/nesujofo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f9a5a639b26791b603ff4fbe98ea80f7/3390031202.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/nebusivil.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c990e8d8c1---40652248273.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16134dd1ec67d8---17963585251.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/99662031828.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/wofasivotamuxu.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/11596118990.pdfIn PDF document text
    • http://uco-kampen.com/media/files/mukapesurefake.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/pururizuvizivatibeziso.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/vaxoboxobutulebido.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/17821693597.pdfIn PDF document text
    • https://videoeffect.ir/data/file/74502083478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=factory+format+androidPDF 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_off0000d19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19F 17048 bytes
SHA-256: 72f3ad310da2d309728ae0e3076da142ce0848290b5bd246023be314115289ae
font_01_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 10384 bytes
SHA-256: 4de31da29f2872690acf5a2b0e7f416f85dbdc7c94e11185726a4ab5bbc9910a
font_02_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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