Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cca6eae4eaa8dac…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 22:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c57c789ff8476f8f6eaf7137650d2754 SHA-1: 47825b566cafe4dddccb5116275415467355094d SHA-256: 7cca6eae4eaa8dac158aed1ee52e3f5f747f9ad585e146506b277c29d6631e64
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://lmbri.com/WYSIWYGImage/file/xowumogajimamutuzap.pdf In PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901225117254808.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/52867300588.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/4892c6fe0e3477e0723477510c8c8fcb/xaxolejukinetajawet.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/14777063668.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/88192105718.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/46500957211.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/46820956197.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/renekebogino.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/86330827579.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/xodukaxafobojusawuvip.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/8896241380.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/97052695374.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161323c98bd84f---mupufekolumuxub.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/wunulepozenenajubuvuraz.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed844695c7---58549576850.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210906080027.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/toburesemizebitonika.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/xikejomojo.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/zeleromaloxugalimunofozu.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/90666619795.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/wukewakimufigumenofa.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/wufotaka.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/nanakegapijuz.pdfIn PDF document text
    • https://ever-progress.com/upload/files/99996123397.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210905004916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+we+can+hack+gamesPDF 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_off0000d2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E8 17092 bytes
SHA-256: 566c99afaf955d2c7b628d12a235269e5dde39ad28cc8da4b00bdf561cd08bb5
font_01_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11731 10512 bytes
SHA-256: 7edeff2ea64c3be348e44b9e9c1e353b71cb870d698159c0814754fe1c3bd745