Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e1ec96049ae645…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 19:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 400bc859bd698adb206ba90680ec877e SHA-1: 684b1002ffa5eddbd4da7f6991def6bd5891266e SHA-256: 44e1ec96049ae6455fb18a0492d94562ced3d7bacb1840dd91d0a683fdfe21a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting file upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344f5e9301f---85904693759.pdf
    • http://d2dgroup.net/upload/files/50575602462.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/liwumoxoxuf.pdf
    • https://mackbeks.com/files/file/63412249867.pdf
    • http://iehyun.com/editorupload/file/90546625910.pdf
    • http://design-klasse.de/ckfinder/userfiles/files/20086988225.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/76354519270.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a167e87d1---sazisupa.pdf
    • http://kengosushionlineorder.com/uploads/files/16097529424.pdf
    • https://edusfera.pl/upload/file/kafubonigurikenavekizenad.pdf
    • https://myparrotfood.com/user_files/files/8441425384.pdf
    • http://mindatpeace.us/uploads/files/retogigavivupapub.pdf
    • http://bmcnx.com/userfiles/file/pilawivifesapipikabub.pdf
    • http://wittlich-luexem.de/userfiles/file/75631987553.pdf
    • http://vasekurzy.cz/userfiles/file/13081808296.pdf
    • http://bio86.fr/userfiles/fichiers/gurapobogifefiguvobivu.pdf
    • https://cabsfromheathrow.com/userfiles/file/87388259919.pdf
    • http://maribon.net/app/webroot/files/userfiles/files/53413076380.pdf
    • http://fructusartis.com/i/File/modoguwisewidawajafijul.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d4ed1f74e2d55f88e4b941a8f02e9dcb/xilixigifotivojikulevute.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134452492980---vabusinulekogosafexak.pdf
    • http://madurastones.com/userfiles/file/sunepife.pdf
    • https://madame-tina.com/ckfinder/userfiles/files/zedekaxivepuvizizudo.pdf
    • http://wamer.org/userfiles/file/kebozi.pdf
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/74813312718.pdf
    • http://siblom.ru/files/upload/file/zepidorujunox.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2885c2d1228010133595d5e9ed82b796/31186812213.pdf
    • http://ammk.sk/userfiles/file/zuborotadorumu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=redmi+note+9+camera+photo
    • 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_off0000cd99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 16792 bytes
font_01_sfnt_off0000e5ab.bin
200c64bb5f82b5282f8efe132346cc3e18afcf79c54ce4f4a4de3174efea52cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 16812 bytes
font_02_sfnt_off0001113e.bin
ef8a6afa26f385eda2041d0f112316bfdd0ba7deb869c4c32bf2e2b8191e92f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1113E 10780 bytes