Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89dd99726e02765…

MALICIOUS

PDF

81.0 KB Created: 2021-07-19 07:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f410e42cbd9a657a46b3338a12ca3db5 SHA-1: 112bca0f8edbc975de21f5b0d3d0c17f96c4dc0f SHA-256: c89dd99726e027651bcaf2456059a5b94a64ef959576cb5eb602a52ab506fa8f
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086415b545ca---kopul.pdf In PDF document text
    • http://agnieszkapawlik.com/userfiles/file/bigakalaga.pdfIn PDF document text
    • https://kaisar168.com/contents//files/mevenajeniwenolikis.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/82064024071.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda89b5e813---35852633701.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/mopaburagonifedezaxon.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/29282541546.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2a081cff2---mufuludedozupinajipe.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bff7cbe272---somusezagutogusumabun.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/lefinapenusewizira.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d33c57d9e9ca42098b74093c38e50447/mufuko.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c580df1996---gaworomonunorisaribojimol.pdfIn PDF document text
    • http://abnicum.com/files/file/fuvadeludorurupakiwaset.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608243c4e6194---luxunosula.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/sizuvenotumi.pdfIn PDF document text
    • http://amandamaitland.com/images/file/nodipulera.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/67131532250.pdfIn PDF document text
    • https://superchills.com/userfiles/file/30330570816.pdfIn PDF document text
    • http://praguetransfer.com/files/file/kuzadukuje.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/fexolosevenosikukefu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2751c2ba9---18746474428.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/61415730395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=electric+traction+lecture+notes+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_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 10696 bytes
SHA-256: f704a7d2f04ff75749ef9edc3086bb80b795f83c100df98e49d81492afed39ae
font_01_sfnt_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 17584 bytes
SHA-256: a9d03fa404a36d1f82517043700ec9d0ed809bcdc7a2c5180d5c05337a3d48e6

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