Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fab442ba27da6d…

MALICIOUS

PDF

88.4 KB Created: 2021-09-07 03:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8d5aa9eef6ba3fa0bed596adc1e7c76d SHA-1: d61957bd0908d891a597e86f03b99c87e79eea7e SHA-256: c1fab442ba27da6d0b1a2141e151cebb115f25d3f61965e479a4f1ec92484f12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=manual+wheelchair+vs+scooter PDF link annotation
    • https://nepalipublisher.com/ckfinder/userfiles/files/62354979328.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/57614140729.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/56558282998.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/05a37cc92114c7de481f3d3e53925ca1/kazavusorupogejuvun.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16077334f13fa7---luwifozarezutupanux.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/24501070074.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/863qrcp854sdd0qhf6a85sod25/tinukaguduxakemuvojoru.pdfIn PDF document text
    • https://parfumzone.ro/files/file/29734556825.pdfIn PDF document text
    • https://agatanorek.com/files/file/gitorevuruwik.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210811024933_3cplas.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/87005845647.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d33cacac7---barukoweperegewekoj.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/memowabunawidosiw.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161157eaf12132---61226199580.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d23a46c7---bezenazur.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/99817974647.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/dukiliwusukomobasepij.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b49d80ffe---tanogitoweguku.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/21114275746.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/rilaro.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/6fdd79d71a64b71e4681a6222beaf313/24203512279.pdfIn PDF document text
    • http://beta-rc.com/upload/files/wurino.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/betunezek.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_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 10572 bytes
SHA-256: f91c1fb84a26d91b7cde05892b1e46347e0daa40847b65036a387ba40e6617d7
font_02_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 18420 bytes
SHA-256: 717f208235a9054ba87ea17da368670e5c5cf8ab96d8779673badc49c5b46493

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