Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14fe791360c3a73…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 13:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b2ad90e3e83f9b2150c8fe4102c554e SHA-1: 3d55c8d1d2ba8303d9580155344dd9764006e137 SHA-256: b14fe791360c3a7398cd81174e4b3084394a5bd4047e421e7af87fb73dd75ddc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing and trojan delivery mechanism. It functions as a link farm, directing users to various compromised websites and disposable hosting, likely to download a password-protected archive as indicated by the 'SE_PASSWORD_ARCHIVE_LURE' heuristic. No scripts were extracted from this sample, but the embedded URLs and link farm structure strongly suggest an attempt to trick users into downloading a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://coretry.ru/uplcv?utm_term=coin+master+card+hack PDF link annotation
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4db033888499498b52e8b372bec97edb/64386910292.pdfIn PDF document text
    • http://scro.ru/pic/file/62435590050.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/57166393788.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607910643c183---nujelufu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a00b00cc2---49819761290.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/53931995854.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/fafurapokuno.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607af186560a7---19945339607.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/nixav.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/32435088108.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fakumupesog.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/fanimojelevivaxafa.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0da74929a---kinorevese.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/4tp3rqqapiehv59r5a02tm73q4/67075231164.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/sefapenosej.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/47318711972.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/vaxopu.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/17840751108.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db24cb5c2f3---35806375598.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/19558615084.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a15d45b8a8---jifusemoniwajivagajutuf.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba1b8b803---44342423819.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/be64634bda19578a2015b81444c0e96c/tomuxe.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u8qtfvpm45qja293ob2trjtn6a/65170789753.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/zapiraxodelakiz.pdfIn PDF document text
    • 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_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 17040 bytes
SHA-256: 0c546167488466c75a2e0b4bb3882ac394faeb390a4c0fe14b0078308f8d4247
font_01_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D9 10712 bytes
SHA-256: 837b036d6e9c25263f652886a3bb55e0e79d45ff72b0de798a9bcd1e499f341c

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