Malicious PDF — malware analysis report

Static analysis result for SHA-256 027970fa971892d1…

MALICIOUS

PDF

73.6 KB Created: 2021-09-12 12:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c4aa33f3db484776428ec417c2dc7ba SHA-1: faca79ee6e25409441c3c1c1d34cc999a97fbc35 SHA-256: 027970fa971892d16034e985161a85072845f4d693abecfda83abe95fef126c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as redirects to phishing pages or further malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393dd2dae1a---vitomukotufuvudilosarem.pdf In PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/buxukumib.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/milafitelitatupanev.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/umruic1kohr89cl01n9d570js1/mexabamevibonogerobawaz.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/dupoloja.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/29e69a232414742a3c94a8d170b67daa/3884016853.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76667846798.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/segemina.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/88750389862.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/d4fs3cete6pk4h44rgstd302h5/xukoz.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109081552134909.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/11434449770.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/tasovanofatifuz.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/wumodapunuvafegu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132dddb9b6ae---47695351120.pdfIn PDF document text
    • https://path.mn/userfiles/files/lumagafixufokurujuwe.pdfIn PDF document text
    • https://solturism.ro/images/file/22585993867.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/81120722032.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/gabixonelerigowudukutod.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/2907751908.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136187e8b031---97516026300.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/63584529294.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/bidulamawuxi.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/voxazagewirapu.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/67794148979.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd4c64660---60499770897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+muffin+man+shrekPDF 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_off0000be51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE51 10372 bytes
SHA-256: e52e36afa7911672bb1822a2fd246c625bdd237a0a0aa28c2b3d0ef7c1e063ce
font_01_sfnt_off0000d57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 17020 bytes
SHA-256: 18dc3dc315c19533916b6bceb4feb88cfa52079bbd0f46e2ff8b9a8f71cf3a5c
font_02_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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