Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf59caa3227efe5…

MALICIOUS

PDF

78.3 KB Created: 2021-09-11 06:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ffc8e97b0ecc8da66e9f2ffc7246d3c SHA-1: 438fff2e906a1d482cbc333cc389a056ad76a705 SHA-256: 3cf59caa3227efe50e862d58694c7824f6af571b3cabc8edef7e8c025de86036
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bamfieldrental.com/userfiles/file/pegapozotil.pdf In PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139deac4dfff---dodubisofenitid.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/powegubowosanevanis.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/977804715.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/63969465024.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/sevewefojewimozife.pdfIn PDF document text
    • http://headrepublic.pl/images/files/vomiwewobiwokogoliwoz.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e95325525---33596044612.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/18853202960.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/zufidadobusologosesamu.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/jebizilugifotoneniwu.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/34004257730.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/bavokaxokavizomesirup.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/79803774473.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/23240425590.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/32977845419.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/fetitisaxijikanetosajele.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/20930463854.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b620b838dc---2542743338.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/mugabegakifizepafij.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137892e1d10e---ninodakazubonubipekuwu.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/92503105380.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/vidujezev.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/808606393.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/jetosapu.pdfIn PDF document text
    • https://senegal4d.com/contents/files/92525929671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dragon+ball+z+mod+minecraft+pePDF 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_off0000cb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4E 17912 bytes
SHA-256: 9bdf32314720398800b86df250ba052243db7c263d8342acf94655f29f18282a
font_01_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 10996 bytes
SHA-256: 1b742eeb521341f8bc994c270f04bf9f634c5d2e27f1afd68c26e493c16ac3b3
font_02_sfnt_off00011341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1