Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b7dce52cfb9826…

MALICIOUS

PDF

92.2 KB Created: 2021-06-27 07:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1e623b8cd1e8ff8818481e021932312d SHA-1: 5c7dcacc9c5268689bc51825dff8605ce8fdec2a SHA-256: 66b7dce52cfb9826d4ae691f5592bcd202dab658a611efd9bdb2a12dc61b7dde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3f4c9bd0f6b422c370a661a5b8784db1/rozoxexitem.pdf In PDF document text
    • https://aradovan.com/userfiles/file/49079341196.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f8040d6eacbf41d627fe5eb650922489/fanojev.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0fcd43f7c---41940484898.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/eac1cf85d43742c1cceb1573803f17c8/2756001277.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/99719265355.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/rfs3m138haskerrj0uno12klm1/82565707021.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/rexifegigobinejirapafi.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a7d9e8f7c4c8afb63f2375190c31aef7/73719800989.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607eacf4e5f84---66666795375.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7a702e6c---66809814800.pdfIn PDF document text
    • https://rajaunited.com/contents//files/mirovivurotuviz.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d669a1720e7---kavofikigux.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160999e6bb8665---getimewonafevajox.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/fikemalixoruzijapekusur.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075b74eb5c06---bafabivamunotomu.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/tufupepelejigofizosotelor.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd4ea4874---71393827002.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/lexetanexotajamotekixutam.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/dbd08b6e79dc8a6070bc5c871830c639/jewizegaxupagajatumeza.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/5059756226.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/90073109605.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb99b999906---66301902292.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/31279598336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=can+i+be+depressed+but+not+sadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000115ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x115EE 17860 bytes
SHA-256: 853584e4a181a0e356f7d3424c9bfd9545c879f582312a33430048e7c6e9cafd
font_00_sfnt_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 16412 bytes
SHA-256: 628ac571b074092425d97c6154a73e271e0685b22c6fb3bd116ffaab331771f7
font_02_sfnt_off0001314c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14963 10608 bytes
SHA-256: 0413c60d5849c03930313845bc7f1a1b6fda0677a30b82da4f6d56a68d596cb0

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