Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1579f5aa48398b1…

MALICIOUS

PDF

70.3 KB Created: 2021-08-28 07:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 855c1383f1cb798e08090e7a76d06747 SHA-1: e584c55951c04cc093b89c9c9900aca8bd3daaee SHA-256: f1579f5aa48398b1a8292fcefaa951a82b2639e75b102a300ee0a5a8f750dd46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160709b1ff10b4---54761065566.pdf In PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/nomoburaguvakexuvas.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/14440762042.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751985e9f45---58964755036.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e71f9eb09cca0b4e412ca1ab3228ce93/fegapototobatuzudavetij.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/livepomerakoke.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/m9d00gl8lfrraagh0vqs8asa7l/loxefura.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/fuweduzaki.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/81468663539.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/73797613081.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3929aaf98---gokidekikokufirabig.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1610a58c829728---lunivategumoxa.pdfIn PDF document text
    • http://midel.me/userfiles/file/zivaregowi.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/47770127212.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f3b401b8---93478197483.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f33cd483ac---58147993365.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/silexuxuk.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ec539d04856---linozul.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608341927a509---betetutinujivuwekepadek.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/temunane.pdfIn PDF document text
    • http://ekotronic.eu/files/file/fagixuluzuwevom.pdfIn PDF document text
    • https://caffedisanto.it/file/13596631534.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/88353637395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=convert+excel+to+jpg+high+resolutionPDF 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_off0000b2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FB 15528 bytes
SHA-256: b2f52bfc91dc7b6ea2c3e3eb98f9c3031da1ba5001f95edf5538bcee01d9cb2e
font_01_sfnt_off0000da92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 10920 bytes
SHA-256: 75af3fb955275f915ac0c2f557a6f9a9f919f377ea447a1f6e429dd478f84131
font_02_sfnt_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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