Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bdfba9b81dd803…

MALICIOUS

PDF

96.8 KB Created: 2021-06-30 01:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 32fb1b35837e87927e6bc628b55e0e56 SHA-1: 66e9aebf8c0a761fc4f38e8511b02f09ccc66859 SHA-256: 25bdfba9b81dd803fd3eb8b1ccc6e886aae8319d7168a6d2cd65bfcaafd36404
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links point towards it being a lure to redirect users to malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://africanhairbraidingsalon.com/userfiles/file/kuloximuxebatedekuvi.pdf In PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9876221bfd---xolimifudunugelal.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160805ff0ecf44---20517177070.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/cf2ed8fc7c1c561ca9bd733aec607b57/tadutuzimad.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/noxulisodegeni.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e30119e247---92091964963.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/gpk79vuv9ebo0bech73nbh683s/pawapironotileze.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/zifujisatijafatu.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/lovifimerad.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/fjhd82c2vj6o3lc4f1o7rmtk77/xenotibizelasubisedezev.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f79f99e0a47902f41a621d22330e8b40/pilopopaxudukolodolevu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b846ea9172e---9969896923.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a40217cbc48a76be5e0f3c88ab9bcd80/miwalelamuselerun.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16088246d127e5---wurizatalidovonikopema.pdfIn PDF document text
    • http://aplus.to/userfiles/file/11504907502.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/cb06a466bfed5e0f93c2fa65e4474ed8/45101018977.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/9912289409.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/424bfa416e83858d729d7720bb2a2ebf/vozur.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/93234788467.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/78029264495.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/ccb46f0a8bd9d13d072a6aa4bcd0bc69/xofogaxi.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f9c5270dd877ee7bebb61428afb3adfa/mobejawegegaridadufutodok.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/57696452181.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/44816630223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=prefix+meaning+uponPDF 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_off000119d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 10592 bytes
SHA-256: e158b7231d4b019b9ebda28abb25e96624affba6e63ca60f39e11a94594ecc8b
font_01_sfnt_off000131f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F5 16952 bytes
SHA-256: 65082fee8f5b6f7eb4aa26015d8dd8e8412307af43f534c3e598c900b2eb025d
font_02_sfnt_off00015e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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