Malicious PDF — malware analysis report

Static analysis result for SHA-256 48397404ceb3c008…

MALICIOUS

PDF

92.3 KB Created: 2021-09-08 01:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed5065be0e305a0770bfbc104b12a862 SHA-1: 7d29e8349dfa7de655ac1c2e0276db2aae7a9dd1 SHA-256: 48397404ceb3c0085cd706e7fb673519d83f4f7b02faa87cdee65be8151222fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://stonebreaker.at/pixefikifejevifuxukupot.pdf In PDF document text
    • https://aksukartela.com/images_upload/files/dizezavadomuv.pdfIn PDF document text
    • https://angkagenap.com/contents/files/22498244995.pdfIn PDF document text
    • https://wagaskar.com/media/zoviteno.pdfIn PDF document text
    • http://bulmarconsult.com/files/41596800702.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/df422f44c7829dffc9f6962433fd0a2c/warelodunilikifo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611afecd5bb5d---kamulubuwujopusug.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/zoxozu.pdfIn PDF document text
    • https://kaisar168.com/contents//files/91538823905.pdfIn PDF document text
    • https://apizf.org/public/file/88779542044.pdfIn PDF document text
    • http://mcutech.net/files/sutemomalidowej.pdfIn PDF document text
    • http://limoride.net/gallery/file/wiwaj.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/kezutamanugejadomav.pdfIn PDF document text
    • http://www.pilartangguh.com/file/jexegefidevigeputoropo.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e2a5a48b75401aca8da4f2df46f40d47/25969424884.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe027662f---kewarulujejanafiraxis.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/tovinagidoxe.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609868ce14431---57121349270.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/banasinimevapo.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/15d06a64c383298c063afa4971427499/99962858549.pdfIn PDF document text
    • https://securitydm.net/slicice/file/legor.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d6786276d---timawal.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210617_5a9bd.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/72370892666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=termostato+analogico+perry+manualePDF 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_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 19392 bytes
SHA-256: a6fdc88f0827f5c92d36c75da4c393ec2695b6c2293f7c961e52701559d6ed93
font_01_sfnt_off00013070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13070 10896 bytes
SHA-256: f1db1be018313634680faecac3748a86a64871af376c4094e047d77b531c447e
font_02_sfnt_off000149b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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