Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d02272406fdd6d…

MALICIOUS

PDF

94.7 KB Created: 2021-07-13 20:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fae8d50c6b7676f5646fa989152d98ba SHA-1: ba63c9ab03627ba5f4eb0e6691d2deaa99321e32 SHA-256: d3d02272406fdd6d659fff8b0ae3c0470db4366e174956c29e659bf637a1fd6e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/46026cc17a1930109408d15de399881b/wubavakonaw.pdf In PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/u2hulmc0upqm10780d0nc8m0r5/85617022136.pdfIn PDF document text
    • https://ekransamara.ru/files/wemutawilevagexivozuxute.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/14767632318.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/kevegodaludamotizosisasu.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db26fd2c948---zatig.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/36paqi4i0nq2o3ft70qa67pfvk/42700282603.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9ukdv4n0s4ui7ni1c213tgcjk1/91246232730.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/vaxelunolekop.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b663ad830f---misotepavukokujel.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/78758674557.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/nefatajamabanoleburojem.pdfIn PDF document text
    • https://drsaman.com/files/wodimuminefupuwim.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/mugonazed.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40829e4081---rilikifitesaregorekip.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052703524538.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e71babb32---jilavezepukun.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/37414518524.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e5faf39aea83dae1fdb2a627f4d23fac/30666450603.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e62cb7dfe8---39252505832.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/866685e27e04aedcec6f9574fb09759a/vunazugafapufivimikefiduk.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/72031542884.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3c21e9b56b0a1b9024ee1e10be99b7c2/sufuwerinabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=murder+is+bad+manners+pdfPDF 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_off00010ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED6 17408 bytes
SHA-256: df64cd4683ca5d54fa152c144010c05eebc02039b3cb5f1626047117fb3a9c23
font_01_sfnt_off00013c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2C 10628 bytes
SHA-256: 83a2264148f69b63e93d33c4c4161a02f6ae835a940f2b2bc149a810f83d4e04
font_02_sfnt_off00015430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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