Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d02251819423bef…

MALICIOUS

PDF

89.8 KB Created: 2021-07-25 12:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1a5a794005235c8df05dc83a52315936 SHA-1: e78460ede07822391417d49af8fdecf8d1e42fea SHA-256: 5d02251819423befcd13182e64b12d0694634e51305fc93883608f99b664326e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wildarium.com/ckfinder/userfiles/files/sakolaxiwufodefodoja.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0ac33c32c106c679e001c95ebeea5d0c/risobunokofizorezivadazam.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106250635.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/wofiburusowove.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/ruposuloz.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/nipoxadibubidaxovuzalotu.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/dajadoremuselunevedix.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/tebamog.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/tixexitiz.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8fb0f43ce721b757691ea69f0317dd17/fibosakuxabitobogizo.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075b4959411a---72959817854.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/lixegebamexuz.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0632294aa2---xefodadapi.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/79804819558.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/if9simennb7j3d1qkktc3p6qdd/memalaraxozejoxuwa.pdfIn PDF document text
    • http://stylekd.ru/files/22276909559.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vowawefofukugararo.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/99agsavqi0tjhmak9t2e1po9qd/pidel.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/e95qe3poujd62bqrrfoofahsjo/zadulafizu.pdfIn PDF document text
    • https://laps.pl/userfiles/file/xifuxos.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a942935ce5f.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/nipikejufoloju.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/ketitobakerejil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hornady+eld-x+6.5+creedmoor+reloading+dataPDF 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_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 11152 bytes
SHA-256: 71f8f79658bf7bb230884b47d3f30bc2f18cd82fe3c87869f70d04800507ebe8
font_01_sfnt_off000112f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F5 17640 bytes
SHA-256: c5aa7718b935f56f79593eea2deddd4c1890c5a3336ee038c9cb99e12efb0062
font_02_sfnt_off00014046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1