Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9db5207a813e2f4…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 01:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 159fd22779d6cc4df0ed2c3bfeb0011b SHA-1: ac38f8009f2946f83f5f8858b066beba2781fc7a SHA-256: e9db5207a813e2f42ff74ffad13673497842eb6710f09640669aedde9fc607ec
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains. These links likely serve to redirect users to malicious content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://tecnibat.net/uploads/archivos/sazolemurepa.pdf In PDF document text
    • http://csc0535.com/userfiles/file/20210709094601_ng2tzu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160761f7ac4863---37043831930.pdfIn PDF document text
    • http://specimport.by/files/files/gekazesikerixuzubo.pdfIn PDF document text
    • https://invest.pl/userfiles/file/16973448229.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a100b3ceb26---2339222926.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/3d8f85d016d5aa1e5e215b8cb442bc04/jeregopunuzamuroka.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a87fe81b0a---watuzalewov.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/72741852761.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/viranulawugalixos.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/68345820841.pdfIn PDF document text
    • http://nature-revive.org/files/file/39751103196.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/gogebuzuragap.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/voturopux.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099f9e6235c3---duzele.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-26/20210726144222234808.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/vajugurerejujobifasi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fc486e0f905---67420481454.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/julifogititarakatafifu.pdfIn PDF document text
    • http://learningkey.org/userfiles/77994714755.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/subaw.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/dobdo886ijh9hvght5kn5m9bej/23062634840.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/89739977765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+metamorphosis+themes+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_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B9 10576 bytes
SHA-256: bb708165ed7688e7c034d87b6fbecd4f5b66c98b732d24546ef25bacb674b152
font_02_sfnt_off00011ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 17632 bytes
SHA-256: 555bd574cd6af2d29a06a37ea8ed7e8cb39127ccd16e7b44e10be455b71381a4

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