Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd18a943271eb58…

MALICIOUS

PDF

86.3 KB Created: 2021-08-18 21:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf05266540cca8f62ffa7cc442d1014c SHA-1: e42e39bcd4ca9be4c1db7a8f1527100a610fc250 SHA-256: ebd18a943271eb58c81f00793097dd4f21a0e78ce4e219c4e09e8375833e4181
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://laborke.ru/uplcv?utm_term=mapa+de+sudamerica+con+nombres+de+los+paises PDF link annotation
    • https://feltshoe.com/userfiles/file/4614277645.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/zerutu.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/54820974376.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/musovajusiwevusatavo.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/xizetubalotorisidabi.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/33622616706.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/lumudexarotogipube.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160aa96fb4524d---wakitevozoxovipitigolet.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e37ba251187560f0753c697a793c4121/12753684103.pdfIn PDF document text
    • https://turbooto.vn/upload/files/zixarezerogumasiwizi.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/jizulonapamawupovibagifug.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da68793fc7---dabusemotakupokitijudes.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/88851237369.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/6f2a7c763d84edeec9282891ed8969a2/niliwe.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/sazizibajezodoraxatez.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/dknmlv1ijkadiroisnn9okodv4/38434719055.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/zavanitej.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/14535313449.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/30809474276.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/niwuxijutobukurojuzedupi.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/9eadf3de041735b8bf53ab7938f10ffa/24924525011.pdfIn PDF document text
    • http://bakoca.hu/files/file/12057770649.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de11fa0d48---salebadotigu.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/71aebc6a260875004fc4b2ad41718cf1/tiferajivozuzodi.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/xopidimedebisikuwonuwi.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_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 10808 bytes
SHA-256: 87eb6184ef015e73ec49dbd17fed8a23a1114f08337ebefdb90b3f06f348c9e3
font_01_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 18876 bytes
SHA-256: b140ca84c7eca6fe7fc77d66ccb3ed518eab4da0de36a47f525b4753a9f25d44
font_02_sfnt_off00013095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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