Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9298e017f04dd99…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 08:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe34b384218f5836ccd0b93f2f6b0672 SHA-1: 878ca0365faf0e08c4caea8dba76a4102509bea7 SHA-256: e9298e017f04dd9955296c4905944e74b1c1eba461d307d2f5f4f326c50a61a8
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically a remote-support tool pretext. It contains numerous links to external websites, many of which host further PDF files, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://medvor.ru/uplcv?utm_term=how+to+connect+teamviewer+pc+to+android PDF link annotation
    • http://jonellchem.com/upload/files/bokewamagotixetu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7e883c03ef314ba643a489fe4a8941c7/96055422857.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/93814b296ee5fba318961833885fa991/jepusero.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/sikaru.pdfIn PDF document text
    • https://nexusmediation.nl/files/88875900722.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/resegisotusurojurat.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///15014759658.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/pizodububifowopawuk.pdfIn PDF document text
    • http://pasted-radio.de/web/files/sixos.pdfIn PDF document text
    • http://didula.ru/img/file/mevadafuvaxemanijuw.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/72615774521.pdfIn PDF document text
    • http://effekt-film.de/files/file/41193697200.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/fukebiwajuxo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c0c5e5a17dd8315c2c9752eb2ec976a2/vozokisaga.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/54866585511.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1cc910a58636e7de6a1f22b24ca871ef/56526615541.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/54595005934.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/63738782672.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/132032116384.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/nafeributivemuxogirusi.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161417e6cbd324---5986349664.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/7631388451.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/13415214338.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316817c8275---kidamupuzawakipumifi.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/dobidirovuxubo.pdfIn PDF document text
    • https://olterus.info/contents/files/69476684666.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/85410344213.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_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 18248 bytes
SHA-256: 6709a2799c43c465d1660f7073dd249404ffdf51267cf3d05e08d930ca49466c
font_01_sfnt_off00011cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13501 10604 bytes
SHA-256: 0127189512923703802b8d609fb3cec01dee396f67c3effc8562554fcd6ff466

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