Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bde84132414044…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 23:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 325a39215002a402d8a719d109d08f5d SHA-1: aa2281f9dba5458321086e6926841249a361a0d3 SHA-256: 93bde84132414044d1b5647efe0d4242d005f41044c3ec873cd64c39524af7f2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of multiple links on disposable hosting and the use of UTM parameters further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/5447b8e6787ea9e8a619f246f9f305fc/21837781055.pdf In PDF document text
    • http://teusz.pl/UserFiles/file/pifuximonamoja.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/kizorumox.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9t3obfukk7i7ck0l15l1j5k246/68473557358.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28f5c4d6a5---84996020015.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b693f0de2d4fe3f9e86869c71fa0c79b/davusevatedurodukozekugi.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/rodulatufawatuxagekifod.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/82298588147.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079169abcd18---38495573478.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/86964872747.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/1932547532.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/qnqtug6jb2ofa96h8irnq8fbm5/kafijimugedorimeruxaso.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/44205181101.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/serobufoduwekoxa.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/24608210330.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/zurupolesawutamafezitojel.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/706h43ihjc929lo8l70mi8or5u/povivu.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/dinokorile.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/95006800904.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfe719bfaf---14538874072.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609440a7726de---kolov.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/7a045b59308ec1a49c0f01deebd0bde2/43316108596.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/92e4s3qubahuto6hcej7cmvjo7/gewasopekuzuduxat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=nifty+future+investingPDF 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_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 10320 bytes
SHA-256: 390b28a98acdb994c575c9ce3fbcf081ba9dafbb92b8bdc0798910bfb8322cf9
font_01_sfnt_off00010363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B75 18552 bytes
SHA-256: 6b8adc9b76196ce2e561be8adfd98dfee3d7bff9f1fcc3d9eaeea92dd5dc4399

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