Malicious PDF — malware analysis report

Static analysis result for SHA-256 083ce6f68c0eb788…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 05:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bebf7652020a18539b2953b657daf531 SHA-1: 7e46bd9418fca545fbe10c04c0320ae0de00aa3f SHA-256: 083ce6f68c0eb788e5e71666767594cd8e21752063bcb98eeb0ff88a8631a4da
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://bonfiremadigan.com/uploads/fckeditor/file/metuvumus.pdf In PDF document text
    • https://chrmglobal.com/userfiles/file/5442577548.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1f748feeb---18754239341.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/465de66de8af83401ad3620b5e408200/zuvitoge.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/81186362478.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/59607387106.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e671ff8cad1---43479420814.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bb76fb62388---wusuzup.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/wifinuvimox.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/ijfr548qjrfoat19170u81gsq0/tipijujixon.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/vezuzojoritugegosi.pdfIn PDF document text
    • http://wirheiraten.de/images/file/51886686015.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/59516088824.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/69288966340.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/34196691602.pdfIn PDF document text
    • http://tulsamemorialclass1969.com/clients/8/8b/8b8b36ecbaf17f244e47af75a29dfbe2/File/kegutezufadob.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/ganebo.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/p8qurg67dmpngr7kpeqjttrrh1/80082130373.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/suvewusulutepudateno.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/60577750501.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/43981050948.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/ribetupox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=good+english+book+for+beginners+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_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 10788 bytes
SHA-256: 16ff2e282edbc861b60a734991b0c0d219205026836f043672bbbddd148a6fa3
font_01_sfnt_off0000f7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 18612 bytes
SHA-256: 8f8fae303b18e7aaf30c6a6b029322f500284d1982a82e3995dc461a50f961da
font_02_sfnt_off00012708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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