Malicious PDF — malware analysis report

Static analysis result for SHA-256 5120acf178705254…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 08:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9d7c481ba9f326be36ce5f381e642900 SHA-1: e4eea322c5b718435e3ea64ff48a773b25fb5605 SHA-256: 5120acf178705254bf7e4a0bd137d9a0ddea5483eb425dd7006869ea61ae866f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, which is a common technique for delivering malicious payloads or initiating phishing attacks. The PDF also contains a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://wohingltd.com/userfiles/73544092143.pdf In PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/rukare.pdfIn PDF document text
    • https://hirurgija.me//files/85238271748.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9c8783ff488bff5f1f0c4770ae0d9668/newenamonuwitixovasoke.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/37486715662.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607855e2c1152---misudale.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/41191765497.pdfIn PDF document text
    • http://keitbg.com/images/files/88429348016.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ce09866b3---dunoferosu.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/1fded992e34e084dcefee691e61ca342/92698687565.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/pasakibojelug.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a6d773aa0---tiruw.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/keporozekijovubewenifa.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b87847be234---pijep.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/jopixobo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f102d9b9ea---wewupovasusujekadixisan.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/63988484768.pdfIn PDF document text
    • http://apcmagon.com/userfiles/luxomogebigi.pdfIn PDF document text
    • http://dzbnf.com/upload/file///wajerojesatefexu.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d992208299---90314715127.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/dugap.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/73068072409.pdfIn PDF document text
    • https://anfauglir.com/images/file/13684966081.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a387e1ef94f---60309575147.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbcd3bafe3a---parurisuxegemu.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56e425def---pipirusebokorudilule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=vitaminas+del+complejo+b+funcion+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_off0000c866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 17824 bytes
SHA-256: 1fae95a5fb3ec0fe2ea31c47f49cf7181b1012e2df196c53b20f2a8ef2f213d6
font_02_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 11020 bytes
SHA-256: 4999660a02ea419957e8158cf3ab9857ab5543e6b1c7863a866571cf834dc791

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