Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc6af37d0fe84e3…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 01:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a8b3b15098514947ad290cb636c2f01 SHA-1: 3cba1a5dbcc4e48d195bdd54746cdada8af914eb SHA-256: 3dc6af37d0fe84e3ac9a91208bf6169dbfa676f8c437d7882a542dfdb28d01e9
164 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF link farm heuristics, including compromised CMS uploads and SEO-optimized disposable hosting, suggests an attempt to distribute malicious files. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a social engineering lure to trick users into downloading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://himalayanwanderer.com/himalayan/userfiles/files/97787110012.pdf In PDF document text
    • https://soenen-pneus.com/upload/file/nabulelonomonej.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/21967057034.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/37370276287.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ad83e64ca---7269327437.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/5289810572.pdfIn PDF document text
    • http://enewind.com/pliki/file/40555459695.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/dezoketegemifobuket.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/12706645718.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/2603885207.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/guvojimiremexetidituzimuf.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/dejupewisaved.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/simadevokoxuzorix.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/jexowowarorudifoguwas.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/sekerijegitefobusasiwume.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/47079753336.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/18504243925.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/novurokuzirokajogarulef.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d1b01fa1af67417633ae9d757c7b666e/25359332058.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4b2cc2799161ac757da159efd7fc9de3/53175185328.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/50412691010.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130749b48a98---jamewerapapeb.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ad8b73b14---66254866819.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614033d06d4d5---1403716995.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/80892364325.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/69156307845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=resident+evill+4+apkPDF 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_off0000cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 10444 bytes
SHA-256: 225f39aa74899fa404c2a97001170bc01a689079ddd9174aca8d7aba1f2158b9
font_02_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 19124 bytes
SHA-256: 940e13581edc3df7f93a32e8ab60ce215e9fb9fd7a7975920222027b1562868b