Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fd05050f9d3f79…

MALICIOUS

PDF

95.8 KB Created: 2021-08-02 21:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 70224f9b717d943b03833b35f5217113 SHA-1: da7c3b5ccba07b84e3d04beb0abcbcb5930a0386 SHA-256: 18fd05050f9d3f7977e1e44484e56b55f8e6c015ed01ad454f255c59a02ade30
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm or SEO poisoning attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary purpose appears to be directing users to potentially malicious or SEO-manipulated content via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a90cc2aca681c2503b7fb6e8d068bd23/59055476995.pdf In PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070df00d5815---vuteresakabiboro.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/dowiduri.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/gesawoligegok.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3d1141ce685502ce06793cbe5d85291c/pupugososab.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7341b6a41---zetibopuragosela.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1f1oao6v7a6of3rd08mv3qrui/fisumunogadufogumom.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160862ee3a9262---15813687314.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/l8md3faj72tlo4cpphdqgeiho4/bodevawakitubebatoluvo.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/1236a86ee7358da211da88b62a397a7c/74598329747.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/20283342710.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903d33f165a---mipugudij.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd6ba84fc0---fukalewitutul.pdfIn PDF document text
    • http://mrsgladysosei.com/clients/f/fd/fd76c46f75d01f7adbe86f52c2a5b8c1/File/pujulibolutifuvexiwat.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/dutigugunakobix.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/wotejog.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f8e4ae230---99442950450.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/mepowuw.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/27705575365.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/52262461967.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/81374032278.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/mitelilolulobabizokit.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/17875253013.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/7680468469.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fe3919f58---gegav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=nombres+de+grupos+de+alcoholicos+anonimosPDF 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_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 11080 bytes
SHA-256: 080b45dc7339fa398bb8c408b487b8d865def1aaebec12ef01e036b0074b554d
font_01_sfnt_off00012722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12722 18452 bytes
SHA-256: bd5b2e8ce981a786fdb4fa90921597b77e5b3cee9cf5bbe13bc125a2bf4150ee
font_02_sfnt_off00015692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1