Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dc90066134b373…

MALICIOUS

PDF

81.8 KB Created: 2021-08-17 06:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e21aad0b0e8f673c469127088be1f5c SHA-1: e09f4a9b4c0f6ee24b565391168f66d6e240b4f2 SHA-256: 28dc90066134b373dd33a2b7e86374f1e9ecaea6423ca8e001ba9ca7dfcd2fd7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute further malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096818d761ea---sosazawiradu.pdf In PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/41615016497.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c677a35912d---rakinamovexazovokiwij.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/58002502600.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/d2a7f7a1fcfecd5d1bad0a09493b6169/81806216041.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/8229ce71b1a41c8637bdf9b51976abb4/sufeguzenolirivodesik.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/jijulakunuvugoreses.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/36817202025.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/83468566394.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/meximiwenesivowuxabuxapi.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a418c31c4f2---pafazak.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/visaba.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/16660071032.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ddfaea7b4---kitivirixerosa.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/80a42fea51741080d5b091bfbbc1e0ae/wujixekasapoj.pdfIn PDF document text
    • http://naucseto.cz/storage/8161463868.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/dunoledunot.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/28405007586.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6fbe9764886d1ed9dbd7588ed7c53daa/94354743872.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d2df39af---18936945591.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/94457118900.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ba4ca4c841f6922c1a68a56b12761ab5/rijirinabad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ejercicios+oraciones+subordinadas+adjetivas+resueltasPDF 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://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_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 10784 bytes
SHA-256: 91cc34dd24f60def69538462a5c0c49be82725935ea666f3ec0936a5c6adcdcb
font_01_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 17464 bytes
SHA-256: 3d256a3d13c058b63f669949bde8ab643b0c943486a10562b649679ab9af7e17
font_02_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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