Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd13ff33051256f…

MALICIOUS

PDF

77.3 KB Created: 2021-09-19 01:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cca6353d8be4196316de400f99b4affb SHA-1: 673b502dda450ac27f04915c2ffe23bfba1ece51 SHA-256: 4fd13ff33051256f1041925608b1f8a77ea9195da9cfaea5e35389441d1f99fb
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the PDF is part of a link farm hosted on compromised websites, aiming to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nfrostov.ru/upload/files/48755904200.pdf In PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/fijokizuxitenavowisonutin.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/59780641070.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/lamum.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/pisivemir.pdfIn PDF document text
    • https://luminex.pl/upload/file/85874486861.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/25021485331.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/65558499919.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614000427ae41---74226837254.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/lisemufojulusujifigetibik.pdfIn PDF document text
    • https://csn-alliance.com/data/files/67691765676.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/vufixod.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/95693656452.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/todopumewoxexizizubu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4575e2c16---35263643192.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/52280188081.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/16686933475.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/91180874312.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/5154862342.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/jifejozexezatiraruwol.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/ratiwewudopuk.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/25206635586.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d0d974deb---91957537740.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109150322107679.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/61942579417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=lava+software+update+apkPDF 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_off0000cf5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5E 10552 bytes
SHA-256: f72912a2013c3b41f57e23eba758487f54a6268ed4db5cbee909ae06f384b7a1
font_01_sfnt_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 15468 bytes
SHA-256: 4b202b536d63e141bcb379757015a8b40ac259750ff75a1eb7a51a50b9a167f9

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