Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc33d13ee9dc4f91…

MALICIOUS

PDF

71.5 KB Created: 2021-10-03 01:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2da14c8fbce9d152f956c81647dbcbd0 SHA-1: 40a39c363bac801440aad8763cd9c522034d2ccd SHA-256: dc33d13ee9dc4f910cd64eb94bd46e5a39748b3c9afb2c9d2ae8bc62e5a4a153
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://coretry.ru/uplcv?utm_term=do+punctured+eardrums+heal PDF link annotation
    • http://deaprogettazioni.it/userfiles/files/nasisutomemupabibosobu.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/48676005.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/41044680704.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/tarebeputesudezezatoxof.pdfIn PDF document text
    • http://scro.ru/pic/file/19041302976.pdfIn PDF document text
    • https://objednavky.dortovapohotovost.cz/obrazky/files/94391768925.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/saxoduvovetuxulibazexav.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/8b203e9c7a819eee278c340a63826c78/sibalisegom.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/1256900723.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/xuwisitekijegep.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/sobuxof.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/c27381a784e7ca0428afaa44f3f04829/xepogalazuxalupaxuj.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/45088760017.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/vuwukomobixapitukekaj.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/54302122252.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/23120707250.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd547e879d---rijipimokaz.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/rowux.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/fuxurovoru.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/topokuxi.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109042330420580715es7gut1k735.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_off0000b42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 16532 bytes
SHA-256: 53211337c9904198f54920d5523023f61860abd7b2df4230ec3df08582690407
font_02_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 10788 bytes
SHA-256: 2d9fedf24c9a0b6c10c9f1fed542733573db77083173c736f45a8d04b4ec1b14