Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdcd40fb3c84a26…

MALICIOUS

PDF

89.8 KB Created: 2021-09-12 10:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3ead1e402ef3ed12982d39735eb89185 SHA-1: fa73b54c8292ed4ce0f48d527d845aa8f639b05d SHA-256: fcdcd40fb3c84a26c38167e19dc42b53fd093460317a338230087c89ec5da14b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous URLs pointing to other PDF files, many hosted on domains associated with compromised CMS uploads or disposable hosting. The primary function appears to be directing users to external content, likely for phishing or SEO spam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=how+to+use+gps+in+android+application+development PDF link annotation
    • http://m-camper.ru/ckfinder/userfiles/files/zukabinorixukosoxuz.pdfIn PDF document text
    • http://konberdbio.com/upload/files/rajizejubimejegotokugo.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/21389716122.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/75420f2f4264402b217f25d7a3288a3f/begoxexevubojubuvadukovas.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613889c1198e9---galumizasunizuwaw.pdfIn PDF document text
    • http://hjhchem.com/upload/files/vakemumovebaduvopolukefu.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/wafari.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a94353c79---11875139319.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109041147201621.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/vofumeroxuwisigabujuza.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/jolipexesex.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/54692606830.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/sopog.pdfIn PDF document text
    • http://ore-processing.ru/d/files/mevupimulawatuwawor.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/61633302156.pdfIn PDF document text
    • http://liluby.com/upload/file/17221540758.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161345a00abdd8---20143556393.pdfIn PDF document text
    • http://sushi-belovo.ru/files/1859368371.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/37097516114.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/83509423402.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/28358261773.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suxamowox.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_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 11100 bytes
SHA-256: 7ee9fff7874d94ed4c415caa64ecf2f8c36392543c9b8538900ab1d38a6e9e20
font_01_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E2 18624 bytes
SHA-256: 3ac3976cbc068cb85c7c2327f3cb7eff2a284fa23ead7809c16329274e81e074