Malicious PDF — malware analysis report

Static analysis result for SHA-256 48618b2dd514a63d…

MALICIOUS

PDF

81.8 KB Created: 2021-07-20 02:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b9b986eb6522054a43ebe82a69df824 SHA-1: 99759009b4f659a002d4bed2b29075ad74edc056 SHA-256: 48618b2dd514a63d8fbbee278d88bc9c488decef319437b0d10ec8d755120259
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. This pattern suggests the PDF is used to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://gialtour.it/themes/userfiles//files/17099225710.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bfb763d39---tirevajidiz.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608beb53b3c75---4554688092.pdf
    • http://n2nlah.org/UserFiles/file/kolepowederivanofelijo.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/db65c382b23448fe685cb3c614fe3ac0/madovagonogosu.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/s9t3cp5voemuufphg374adninb/tofenot.pdf
    • https://ubk-sad.de/azubi/userfiles/files/fidubopazijozose.pdf
    • http://jiangsutravel.kr/userfiles/files/20210614_220806.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb60bd32b5---govez.pdf
    • http://afghansolar.com/userfiles/file/jivarelalisuziginuk.pdf
    • http://magyaringatlanadatbazis.hu/dev/_user/file/wesuguzolok.pdf
    • https://angelsforwarriors.org/userfiles/files/ziwala.pdf
    • http://barcelonasixtytwo.com/userfiles/file/demitefulav.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/64916290490.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2d923a59f---73909315326.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16084a91c6f5d1---kemozirod.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/df7b9e7cf24ced3aee6f8f8a301e3ae1/kidasizisazevuzaluxig.pdf
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/33623702101.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d430d027f6---jevegaselebiji.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/e79f8c8fbb807ee9bebe8903380a083c/43536160216.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608512a44deff---fakek.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/faeb037aaebe6f4007600cf74cf732cc/81048666167.pdf
    • http://viettelhaiphong.me/data/dulieu/files/39277364418.pdf
    • http://noithatnhapkhaugiasi.com/luutru/files/revugolizen.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=are+plants+decomposers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e097.bin
7ee0e8e97a64be28c2105c9a67d8d45780088773fe28d1c1cedfae06b3e68881
pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 10564 bytes
font_01_sfnt_off0000f8b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 16792 bytes
font_02_sfnt_off000110c9.bin
ff3df3c16f5fb75d92fddf56846f30b73d389288140cc1a17b4d5b4d26470d04
pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 16056 bytes