Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d06c99908caec19…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 04:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71a6afe5253bc0977449e7ec80d334ef SHA-1: ce7340c89e5494b029c600b61eaba0bcb17edfce SHA-256: 2d06c99908caec193364fefb9381b7f0f9ab0458d4b74f9db270698ed2efcb1b
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it is part of a link farm hosted on compromised WordPress sites. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially malicious PDF files suggests a phishing or malware distribution campaign. The use of compromised CMS upload storage points to an attempt to disguise malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac666435034---lirabitifamuvijopar.pdf In PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1b7d7cbc---fowexokasakuwoj.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba181ec2df---4049459988.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce40c52962---bukopixon.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/zijuzevaw.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3542ddef7fc6916c74d3a76cbfa8e7ec/xolafum.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b0789d4a917d4c465263037775a7dd26/72815516469.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/aee25be19b1acd210be2e587299bcce2/wowexogopureb.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16dd40ca7---72468491776.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/31798175473.pdfIn PDF document text
    • https://actor-conseil.com/files/file/xavegukijuso.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/1030092721.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6ecff1c4d---68843634738.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f41400fb84---jaxuzovuzorixavenabu.pdfIn PDF document text
    • http://www.toptehnik.si/images/70006469069.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c04d8955e90---63310175565.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffd88ba5e9---depofudetes.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/86452158637.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f91a80122e87f37a6147bf064fe4964e/lanitufojazes.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1ca3b05615dabf734f5e2e007daad963/regakimejubulirolotugawo.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/asrufiaf3ib951kmmlkbrv7r0g/mopojoluxazidogewu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/796e3284a391add6aa4583ab130c94ba/69025081189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=apa+in+text+citation+website+with+no+authorPDF 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_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 16884 bytes
SHA-256: d8fa6c9c82ac38759c211c774a773d40e0e4ffb15886b16cfddb0ca85210935d
font_01_sfnt_off00012137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001394e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394E 10836 bytes
SHA-256: 2297ce742cf5ab33951c4c0da581331270caba5d1a9b26273a8a2b488807489a

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