Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbe5bce744ef7dc…

MALICIOUS

PDF

75.8 KB Created: 2021-09-07 21:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 176cca61c979b83e5904bbffa08660a8 SHA-1: 3d298ac5b473470c9efd61491ecb818c73ef1268 SHA-256: 5dbe5bce744ef7dcad99a63016f54529c78e5b9876c34db85b746c51e4a38d63
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104de8900def---depoworoxago.pdf In PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16091b5db3dc5c---61283410572.pdfIn PDF document text
    • https://partnermind.cz/images/files/25922001087.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/68811859744.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e7u2hk7r4c57ba05jjsi90pdd2/98520034427.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16137197d4a6c5---filuwaxeferele.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/29475503487.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/kavakedojabavisutub.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/95982503902.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210605051907.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d6724bae78baa87cda35da28d3c1865d/37760444222.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6bbc5ed8f6---93069735857.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6c83ed9572ffb37bc2ed1aa37c509470/zidukumiri.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/d651b385e69beb3e9ffb2fe0eee0e699/57400506734.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/17472869231.pdfIn PDF document text
    • http://stavbyhes.cz/ckfinder/userfiles/files/sakeraneti.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/4893981425.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9c1757006---4165109830.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kib5emadk3jcca0ki566jaq7cb/61544623196.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ja5qqa146og1tsth7lrk0hcune/25301324217.pdfIn PDF document text
    • http://skupka23.ru/upload/m/sivubodekivarugomosaw.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/171558438846.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fa2eabd38---sipuje.pdfIn PDF document text
    • http://zae.me/datafiles/file/pazifujekodafumasi.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/sewoponubekesotij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=administracion+de+recursos+humanos+pdf+desslerPDF 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_off0000bff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 10964 bytes
SHA-256: 7bbf8429daddb05bd5153108587dba4b31518194acf92c9c24d864238f0aaa4a
font_02_sfnt_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 19232 bytes
SHA-256: 638e88d61f8895d8846535561f3bb927ded944897c881fdaa7f144761d9c4e86

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