Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5165cbd3a79e1c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 16:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f770d477fd696e0ecb78aa898c4da58f SHA-1: 9caa5eb564520e5a6f70409f3879c1d2b9a9fd08 SHA-256: 0c5165cbd3a79e1ca5e10b187d82c96b95f00bd7d25da89951ffbb42f84104c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://promptcorporate.com/ckeditor/ckfinder/userfiles/files/94019754163.pdf In PDF document text
    • https://anukulagrotech.com/userfiles/file/27242461659.pdfIn PDF document text
    • http://soupworld.de/upload/file/vabat.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/lesokimobujotigajuzev.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/65530602931.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/refovunomuxesi.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fab867b0---zinusiloba.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/vewagulofuzegixobenaveni.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109141153321765.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/34465480956.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/52090af2b527a5f608cbc19788f4e785/60828908959.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210911005347_7m2opr.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/vilipipamazogijuteri.pdfIn PDF document text
    • https://questyme.com/userfiles/file/fepinofuzusuwejasurapimo.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/13810359283.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/dosivunidodofoborudedew.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/04d569ae5beb54f788cddfb4b12f0eec/fokugemigalegojuvewikag.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/0d8b46e550438243daac3314ed9c87f9/33423142038.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7ecf2004a64d0649d2aa95a85170afac/47685094073.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/rawofuwiwomojeb.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210911114753124.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/weranudininoparunopod.pdfIn PDF document text
    • https://linker.tw/files/bixilan.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/xulurupok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=crossover+chrome+os+downloadPDF 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_off0000d5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 20460 bytes
SHA-256: 4f17ac2c669dafd9798e7192dfa76f58fa00a0d9c41d0aaa60e069fabcf2c23a
font_01_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 10628 bytes
SHA-256: b6401713a0694fa784874dcddf1db9f2553c7fbbf014c4e049fc8104fac5025e