Malicious PDF — malware analysis report

Static analysis result for SHA-256 da78ad127acb4e3e…

MALICIOUS

PDF

87.7 KB Created: 2021-09-07 15:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be02254f0d88cfae2866fd845c4ffd98 SHA-1: bf079d5be3394ce7a7b8f067611e6cd9b41b5842 SHA-256: da78ad127acb4e3ea1eb6d6024af43ef478da9be7b1fa8e0829aef28df0ee166
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, which are used to host other PDFs. This pattern is indicative of a link farm used to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://virus-safe-zone.com/ckupload/files/linuzanuvuxi.pdf In PDF document text
    • https://airflow-skateboards.com/upload/file/betoj.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/pj8gsjgn7de6hahi2k32tjj190/pevip.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d36bab19721---29988422599.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/1962f9597fb913e1a0a7e713b89547c6/89350840156.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/40a46986c2af57c89f2f6da37e65559e/papij.pdfIn PDF document text
    • https://aashianarealty.com/file/34266476801.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9969d502a---90112628470.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/f96cfd1cda24003bd0f7ca8d1dc92d82/xujolaligotopamu.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808a4da7555---sikov.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/78792349304.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca70ba0ef---lubuwebusipikoze.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/83c0c7e826bed7da5193fd49c87d2f43/patugututirudefuzojura.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/luwetelubisepusuvuwediw.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce95461e92---71644287704.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/258375727f239a6b8c1da04959eee644/86568281589.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070acb262957---46216544106.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f088a8650a---pipifatilimoxuxadurezazar.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/gakuwabevawiro.pdfIn PDF document text
    • http://martonelektro.hu/files/file/sowilox.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a6661eeec5d6243cb2570d09e107a1e4/81995006557.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/gixixuxeri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=vectorworks+architect+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_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 17276 bytes
SHA-256: eb4d407c786c5a7d3126e5c6458bd4146066cfa76a90912ad30f99c887c5c65e
font_01_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 10712 bytes
SHA-256: f24bca36fe22fe1865a5780dd431483e336f30d33b771d48d784a7d54883c483
font_02_sfnt_off000138ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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