Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ad36b0a12b5aa8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 10:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f3b38a622cbdbbd77cb3aa94e165f256 SHA-1: 89481360ca905540f46f5b00d01b70ce1be264d6 SHA-256: 09ad36b0a12b5aa8201f3f1091b1a7c7416c1ec5200ee3a26086b1bebfed8e19
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URLs. Several of these URLs point to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing attacks. The PDF itself does not contain readable content, but its structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://acryl-bg.com/userfiles/file/43223438693.pdf In PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/1181924543.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081dd9a751f3---37262573814.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/25227470192.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072197b94ef7---nufodukixoxovajijo.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e975fe07cc3---59969485042.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/70284911271.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/64695771334.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/74897193922.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dbfbc6b9e---mijezelagogajafol.pdfIn PDF document text
    • http://kotolantopeni.cz/file/taraxu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eb9e29431---63000439919.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/8ffdb8d87282deb6b7d3c62d3eeed27e/92455406169.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/rkqq95660nuqfcnk425e2epsk2/79465958668.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/ketulofizozofolutu.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/65329277517.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1417023c29---42039955750.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e79f4db208c---27050495084.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/mimawupirewabeb.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c19f5c458---poxopak.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/54139100458.pdfIn PDF document text
    • http://warehousetraining.ie/images/daxoketudefib.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/nomedaxewomoxejonovegudi.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/88207199854.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/bobojedujupemunij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=disaster+management+project+class+8+pdfPDF 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_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 17284 bytes
SHA-256: 8c62632744405d38e8455efc502e5c89574ec8b46b31da183b923594d9275b68
font_01_sfnt_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 11304 bytes
SHA-256: 9e84260f808819e3ea521ecbb7d5a37f5cb3bb4a9221d7d53f338256cd815a4e
font_02_sfnt_off00012488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1