Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc67f9702166ad8e…

MALICIOUS

PDF

82.6 KB Created: 2021-08-17 05:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea93cedab84dd7d8c12eb12704ad37fa SHA-1: 775f9ab2a94e495b8547e2bad186d0ed80b759b5 SHA-256: dc67f9702166ad8e7d793418e641fa745da2d5bb7595a5bf0674211ee81681ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the PDF is likely used to facilitate phishing or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://laborke.ru/uplcv?utm_term=miner+premium+hack+apk PDF link annotation
    • http://kvbm.org/pds/userfiles/files/68738900715.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/zolafixunu.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/nodabanizunij.pdfIn PDF document text
    • http://maidichike.com/upload/files/24701546315.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210731123656.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/3a6b7410055dc87d5baa2bafc594e981/71486614423.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/4fc157b99a2b485b21f6e6954ecca73d/60392538683.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/6225088175.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/18729274532.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/soxeruvuduxo.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/zexule.pdfIn PDF document text
    • https://aedwea.com/upload/foto/40642612011.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/78285928817.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/75333548248.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/0399d4a09360a54265eaca16b7052f1c/tujimamowumofixoz.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/xabul.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb514af3ecf---tapubijogelidor.pdfIn PDF document text
    • https://rintrans.com/files/zememif.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/19367838793.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/99531811868.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8525a21a04bb5308d91cbb272e153c3b/siselelibiruki.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/660es91dvnvvsubcbncpjfhug1/kixiramopife.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/vibisaje.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/zaterupuj.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_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 10392 bytes
SHA-256: 6d24b4cd1dfed7f41afa498a56603fe27cd4430deef502400388c32041e6af84
font_01_sfnt_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 18300 bytes
SHA-256: 391986a990e009966f89878f996877d64266d0ae149dfb5b0ad636b4a3058937

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