Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f38c6fdd2e7eaf1…

MALICIOUS

PDF

92.3 KB Created: 2021-09-10 13:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c32639a8ddfefca327f6016a284b333 SHA-1: 115bffdfa9a1ed562ad81c652de9d6d5e0a2b5d9 SHA-256: 8f38c6fdd2e7eaf199835508e40e10fca1473ba7f6813a84a6ccf4af320b4457
224 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The critical heuristic 'SE_SECRET_RECOVERY_LURE' suggests the document attempts to trick users into revealing sensitive information like private keys or passwords. Additionally, several heuristics point to the document being part of a link farm hosted on compromised websites, likely to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://turagent007.ru/userfiles/file/ledovodilo.pdf In PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/cc1898f8961233ae1d4147ed55fb01f9/nifawabipifuxupisopod.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/93916284097.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/96538653714.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/virelip.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/vuwafinu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b30b962dc7---88934847516.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/70669445888.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e4cc725c5fd7f42381f8514698ea0fd5/xuzewixodukemijabazizuva.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/12838603441.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/zavofesozipip.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/3957657775.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/jodiwiximaxarujikobimise.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/15074441235.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613856468d83e---62689007228.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/55728523026.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/fobesuza.pdfIn PDF document text
    • http://gaudi.tw/upload/files/44248876037.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/koromi.pdfIn PDF document text
    • http://christopherdallo.com/file/sanowekusotufet.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363cb57e5c3---62386661302.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133e1a25f3e3---gosanogemevixajar.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/rasumokubutelovuzilimavin.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/13034106121.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/jexigifipivibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+install+adb+in+ubuntuPDF 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_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 19248 bytes
SHA-256: ab5b8eaba10f9b99c70d2b981c046229392ae30282da9f95ecf9b0d2315a4d05
font_01_sfnt_off00013468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13468 10328 bytes
SHA-256: 5f615c5f9ba08949666df5c2a954edb0d26856cc2a0b0ea8a09ffe0120800c7e
font_02_sfnt_off00014bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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