Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54034c9fab9df36…

MALICIOUS

PDF

74.1 KB Created: 2021-09-29 00:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 716220528008a347881d42ed8d0cc9d0 SHA-1: 2623983d3d4560f5469fbe26268fed6b971f3d04 SHA-256: c54034c9fab9df363145717612be1d46125ee7d6e8759d64c23d7e5c0698b713
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://ritadas.in/userfiles/file/naratulu.pdf
    • http://sial.pl/galeria/file/jomedeka.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc39398fe4---wuwofuziw.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/1ec2cf79b1e2896b35036bf54b852fd7/21672871458.pdf
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/pupifodoro.pdf
    • http://canoeing.by/pics/files/67368831109.pdf
    • http://nacyc.jp/Upload/file/lowujukufuza.pdf
    • https://kujainspectors.com/candyticket/uploads/page_images/files/52673563099.pdf
    • https://alaskaproauto.net/nbloom/fckuploads/file/41979115349.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613caab7e74df---87287502806.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/valugezalebobepepufi.pdf
    • http://movitecnic.com/ressource/site-image/files/11853557218.pdf
    • https://odontologosmalca.com/images/userfiles/file/biwigijebemipu.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/bubowuximavikerijuz.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336a9fd3d7b---papibujureditij.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/73205538126.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/a7lrhrl9ucjtckhtuhu4qalu1i/siroxa.pdf
    • https://pioneerlift.com/upfiles/editor/files/88085441813.pdf
    • http://files.ibiza-ferien.de/file/mofuwulelasipev.pdf
    • http://vetportonaccio.it/userfiles/files/10413220370.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139da262865b---gapulag.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/nbn8pb0hmhv8s3j8fugogbku82/50895883046.pdf
    • http://ljjxmining.com/uploadfile/file///2021090900081319.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f899518767---vulijukuxevadekuwe.pdf
    • http://gccde.com/downloads/blog/geust/files/xuwezukevugetelogogawiv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=naruto+shippuden+358
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F6 16792 bytes
font_01_sfnt_off0000d20d.bin
aef4d142b78dd6d92365a060ef24ad781d34476bc3ab96e2c50601ab0a1cde28
pdf-font-stream PDF embedded font (sfnt) at offset 0xD20D 11036 bytes
font_02_sfnt_off0000ebb8.bin
ce78dbb22f7226933c208420bb4844ab0a36f7fa438f205a5d1a6d5d98a7a259
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 18356 bytes