Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd5209e2f730b4c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 10:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 856c56dee1908a894eb660fa02e1ccef SHA-1: 0e75d09fc8c53680a7e7626e5e8902d6b74cd242 SHA-256: 4dd5209e2f730b4cecbde1a883cba0d765b22ff31984c43573bd16dd03d462bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or downloader attack pattern.

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://allytemp.ru/uplcv?utm_term=download+file+pdf+jquery PDF link annotation
    • http://crackershrimp.com/file_media/file_image/file/26699932914.pdfIn PDF document text
    • http://irths.com/upload_files/files/xapabagupabewi.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/nidadiwa.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///laxivowilimewosukes.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5ba4780dd632e5c9e74eed4eb41a4116/72055590949.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/segubujapuwijugijagojolad.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/crpu8go6eri4mum0pi59445v2u/51486371693.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16c03c0be---zirarurofos.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/27929e25afd84b0deb2f69e78bf70ced/11500335053.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/bokepa.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/47375301399.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4cf8d7fec8b656ae14eb27dccf5b7a79/78670871867.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/xavipevowa.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/15014872578.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/35120552410.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/0feb363204527a1426471316b396cc08/wefozixero.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ab7381110---42230127840.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/e97356cduai7mg9dbehu375p61/sowavu.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/kawat.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099f9940b43c---56101242657.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/17798569386.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/43833030467.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096256b74e94---losajuriloxesonevuwomene.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/zexovubejakilugerax.pdfIn PDF document text
    • 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_off0000d1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 17772 bytes
SHA-256: 2473ed5cd7da9636c7c729bafc14ba5d60ead7f1e95327b55859a8544d60f8db
font_01_sfnt_off0000fe8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A4 10804 bytes
SHA-256: 06412075d81795d2e8019d546fc4411e8426b405badd7e8a6473123ae8a7d090