Malicious PDF — malware analysis report

Static analysis result for SHA-256 01233f716d497e10…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 12:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0e67f55931d472dd707d1a66b6e884d SHA-1: 9c12915b6b179f197ad50222a56d450dc2843241 SHA-256: 01233f716d497e1014b0671ac1511e21c37e1e94f20b00ba561a46d55a00cd0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised websites or disposable hosting. These links form a link farm, a common technique used to redirect users to phishing sites or download malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://klinok-saintp.ru/files/11089138833.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16111f10505ae2---ritidosatitomekaj.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/22436979101.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/giwinigoderixuwoton.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/52913333909.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/rivumiralumonezisulajefun.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/73f36f61dc1f3ad5c4219f7365792ab2/wowukurelamoli.pdfIn PDF document text
    • http://gabortech.com/admin/file/47034293355.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/d4d18930c5ef7be540c7679ac03d8860/tivata.pdfIn PDF document text
    • https://tepihtrava.rs/files/21976709318.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/kabixowurejutugojogu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096c2ea0b985---27620282149.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/linuzanuvuxi.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/11487505421.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/10335852324.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/5068810298.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/wukulamojivitamowifataw.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16120dcb288304---tagizewuwututupuwej.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/2799125496.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/19028168624.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bbd95f349d---38015787634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=4+phases+of+disaster+management+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_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 10880 bytes
SHA-256: 2dbf7e9d4e2488abc5c3d71f3e748a9016abd2c19bd5512071403cde28d40394
font_01_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 17032 bytes
SHA-256: ae1df86c6bbc31815125a4c8ac24464e02b5994089f3d3a9c37657b3a21fa1c5

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