Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39f1ed23a52b82c…

MALICIOUS

PDF

85.8 KB Created: 2021-07-03 21:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b01c9a6a57363bae9b0ab803bbf3a028 SHA-1: c4b3cb2c41330cc05f345557e613bd65bed611f5 SHA-256: f39f1ed23a52b82c9ea24927d143650d8a956fc7b075034bc3dcd3e17e497ece
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary function seems to be redirecting users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://washlounge.in/ckfinder/userfiles/files/94683639173.pdf In PDF document text
    • http://cbgnfinance.com/userfiles/file/pawanuk.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/4vef9234gcb42jmsrkgmo9332t/30294461740.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b742004fb4a55d60cab9d657ef44dc38/35675501856.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gqhldtr8r1fij4632aps07l2u4/78120799452.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501054322833475.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf033af91d---71096586884.pdfIn PDF document text
    • https://la-klamm.org/Files/files/kipijokowiwoguv.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/e9e542f6b85534e851da147dc6c86879/58925509052.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/wodijawigafofovetomep.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160820c3663a98---lixediri.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/46070538849.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/ratovuxisonu.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/3fe9e81fbfa4b1b7efd3f9f34e9fcc2a/73446749617.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b88bc38c921---94998505893.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/47be6145a70c9459de4f3573203ee704/13742198093.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/67157381277.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/32194aec2d28dc1145cdeb957f7ee55f/39448079296.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/17741364633.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c18510065bb---22031997352.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce58c3bbc---noluxagipuleburevela.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bffe72c9af9---leligafefelimasetakudiw.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/xevuxusexez.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/79377711427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=simple+alternative+funeral+homePDF 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_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 10696 bytes
SHA-256: 4aa92058418102aab880e179eb1e168ef9ad78deb061c29af9c5526f701de8f2
font_01_sfnt_off00010646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 16736 bytes
SHA-256: 3c34e829e554751244ef564b4aad6595a4892e6a4b8c4868d2673b89edceaf93
font_02_sfnt_off000131c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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