Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca7a8855eae7a7f…

MALICIOUS

PDF

110.9 KB Created: 2021-09-01 04:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7665ff2dc25719e7635dda0f29e5b7dd SHA-1: 54a16228f40fbec442f3b72c05435e9c5ec9138d SHA-256: 2ca7a8855eae7a7ff961189a3d3185c79abdb426c18cadb7024f456793bb0974
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://montagnobozzone.it/userfiles/files/76077593216.pdf In PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161171570a8c3e---62705659508.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/wotuxalosa.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/lstqarrk63ll9oebeaf15c100p/vibaxi.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/lilokarebejufixuvusi.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/73301126636.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094afc1d8622---gadaboxuwibisox.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b372feec44---2760487247.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/53472863504.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/552cec028792c39b5c707e151fdbc629/31335026560.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/59274859638.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/jogipevob.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/005205362e0f73d4c7f4921cefe90bbb/26360178930.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/43746108217.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/38708145013.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e85e64e9a400606d2b402e8cb6793c3/32905968293.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfd03e827---kokademadewomuxesejiz.pdfIn PDF document text
    • http://primaneighbors.com/userimages/92424711664.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/reduxotezomitepodumolima.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/46498003949.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/48189551423.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/f73814f6baa55081658b1cde7ac704f4/xejipabutugumanukov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sims+4+eco+lifestyle+cheatsPDF 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_off000149c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C5 10664 bytes
SHA-256: 6e705d7e9ece6a9c5857fe51d6d3581387eeeca51e2e593d19aa03f538bc69bd
font_01_sfnt_off00016244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16244 19884 bytes
SHA-256: 1768455b9497557e0580544bfbd81842e52ccd47a30e8e090ca7793823a0e1e5
font_02_sfnt_off00019635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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