Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97f73376fa00fd3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 17:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64ce3ff34f64fd402b73abd1ffa44998 SHA-1: d09315a5a97e889be1c4aaf77b6f7868c44ab8f6 SHA-256: d97f73376fa00fd3de57131ab0d1c13274b9a74bfbd3bd3b7b32b187d60a5a13
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which host other PDF files, suggesting a link farm or redirection mechanism. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into revealing sensitive information like recovery secrets or private keys. While no scripts were explicitly extracted, the presence of multiple PDF-related heuristics and the nature of the lure point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://profil-metall.de/content/uploads/file/77519471948.pdf In PDF document text
    • http://elcivan.com/admin/UserFiles/file/13771992847.pdfIn PDF document text
    • https://emmaushuis.org/pages/98717117545.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136bfb1dfab3---figaguwitas.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/jadiburinusupofano.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/vivikekuvosusefapamuzuv.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/xojuxadamanukuwijepevi.pdfIn PDF document text
    • http://hadt.vn/upload/files/63919750276.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/vafebabiribumaxa.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-19/20210919010655606142.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/pikuzesiwugubukawifesa.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/kudez.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/37564631208.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1a9ae0cf8---65468491033.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434137a359b---955660688.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202194_161718_481.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/jelujipuninewebidav.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/xowofonisedufuxuse.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b17a912606---82140197205.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ce0jndhpeonvpp4e60ds0h4oh6/nibuxiresimuzotolipug.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/86825323104.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/33652516758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=whip+it+full+movie+online+freePDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/69924493715.pdfIn PDF document text
    • 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_off0000d8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 17076 bytes
SHA-256: de78fd308aabe1cddef9d5c8699c1c1777ca8fc19c8b7ffc6fafc6025e59585d
font_02_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 10452 bytes
SHA-256: e3b2879b954222a8168966f1428600f54ed1006743e18c53972cd9235badd372

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