Malicious PDF — malware analysis report

Static analysis result for SHA-256 17979b768e714aa3…

MALICIOUS

PDF

87.2 KB Created: 2021-09-09 03:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b0d0b5446680a09f717814a581765a7 SHA-1: d2ddcb8ca856873be5d817292e51f38ede989ba6 SHA-256: 17979b768e714aa36e28794eeafcd484a26db9c828748822f715fdc484fece24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to numerous external URLs, many hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=tanauan+city+batangas+zip+code PDF link annotation
    • http://zhizhencn.com/filespath/files/20210906022440.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f4573afc6---damegaburusep.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9ca4ab24---guvopelozofa.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/rolimukokigusa.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/57475859856.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131be3e8a39f---5144119520.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/febavike.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/meponujasitedomekaguzil.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/9339754095.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/77132422465.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/23608751813.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/14585648617.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210909_9FA09CFE498640A9.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/27581188920.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/felogulesuwazenefipus.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/cdc0a4e4b66325ae99d7e1c2c29841d5/fikozupixino.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f9fd4f461---xigewunon.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/tojakutuxakiderewasewotel.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/64643341691.pdfIn PDF document text
    • http://headrepublic.pl/images/files/30080482120.pdfIn PDF document text
    • https://arendic.cl/files/kibewazi.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/46677516014.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/41755362814.pdfIn PDF document text
    • http://medi-sen.com/files/files/35083691861.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_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 19852 bytes
SHA-256: 89e2bcffeb087563f169baf8d56f9d88fe4cd8f7c43c44cbce014b94a1cd5b97
font_02_sfnt_off000135d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D9 10920 bytes
SHA-256: b521111f7528f2c667db05e3bf3c94ee1e856a1f706242696cf2363363dfc94b

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