Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58e7c33b7fdcf94…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 23:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16ef53b741fe8de15d866fb3a1852e28 SHA-1: a887d5957660164d147b489e5ac45549a6364d36 SHA-256: a58e7c33b7fdcf940fa1e6f553b8c3d18db3cf6087b055c3740e4e5745d5a0e7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS uploads, indicative of a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=the+kite+maker+short+story+pdf PDF link annotation
    • https://spacio.hk/attachment/file/75020652065.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/fedape.pdfIn PDF document text
    • http://torgoborud.org/images/file/rolukumapufuwofemimofotiv.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/96272510521.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613838d8852b6---xigiw.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/kuvupoduxagu.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/41331438484.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210901095549.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/22708130662.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/lekejokokedifawijunujiz.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613be586796f7---15685570837.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/jibepasunekuku.pdfIn PDF document text
    • https://equimat-cheval.fr/file/majolowapabojete.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161302f01a064a---44045476429.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/pejesukopuzitowawasozup.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/rojup.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/baporasifez.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/48532100104.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tqf94uvbffigv5atikvpk688a7/tadokosiv.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/dafabasota.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/16244041924.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/betoleg.pdfIn PDF document text
    • http://sql110.com/pic/lamemasabesu.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/jaxemabazarebomuse.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/ditobeburozoku.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/24418320637.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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 18204 bytes
SHA-256: b1f998ca0171392b7977866b6b5bd46047d380e9cab311361368e9cfff27e751
font_02_sfnt_off00013033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13033 10780 bytes
SHA-256: 0e7485d73912d5a40ae7883de5bde19310165fad3e0105fdb237f8ec302b6f10

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