Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee4d9fa376c3863…

MALICIOUS

PDF

75.5 KB Created: 2021-07-08 21:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: d7537a15c7798acfaa115fa409db2113 SHA-1: 87d7d1401dae1942553cae2829f392dedcab4d0b SHA-256: dee4d9fa376c3863d10052a33c3ffc5a4f08f8266e6b02c0bb72b3657e6181d0
196 Risk Score

Malware Insights

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

This PDF contains numerous links pointing to compromised WordPress sites and disposable hosting domains, suggesting an attempt to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute a payload. The presence of external links, including those on compromised CMS uploads, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160832e3a70238---78321541725.pdf In PDF document text
    • http://cdmatik.com/uploads/file/5159544485.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e1a0293c2be47967bd3082573a5a3432/pivovap.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4aa5793cb5fda3440bad4f70347650db/taxiwovokirexodamegiji.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f7c3eaa17---guxel.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf862c03e5---25159240259.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609294662641e---pelifexu.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/da2d2399c891b9f18bba70a842b9162d/32411390210.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94a3c7b40---jalojaguwatipagelepulu.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/kizezosonug.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ea0cvijef80dhljda0ftngvjn1/44043216891.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/50548927285.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b437dd0e---jerukam.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/31361082897.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/titupulu.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/punamovugadat.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9cj1el2uolr8bpvk6qdh3jl0e7/gofevividarojufonuvev.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/cr7g9p4qec2s55g3pdghbksj8h/bigidi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3dc9f7ec0fc7eab67e2cfdaa936b614d/26375939569.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/27754654685.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/609bd3ab8e61c64ac7ef3ba3d4e21373/42153595840.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/65879751407.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/busabotutezufaxewumopi.pdfIn PDF document text
    • http://petrduchek.com/files/64458060262.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083fecd8f2c9---xixoxexaxesizofiv.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/c0oalb24lmf13q7vijdb5o5l3b/15229537442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ibm%27s+chess+playing+computer+crosswordPDF 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_off0000c1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 11384 bytes
SHA-256: b2e7f7c552cae8e2d48f62cc6493f7d755c3a3bbe32a9339b73e9fcdae251ad2
font_02_sfnt_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 16992 bytes
SHA-256: 5833bf8cbbf96f76e3ae8fc2500776a1a514fdec7ff8cf07fa3503fb47e332a1

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