Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b658a2b9b67b559…

MALICIOUS

PDF

95.7 KB Created: 2021-10-15 14:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 999bfe1ba900391f23a24ce63eaa6ac6 SHA-1: d21ecfb1a9a226311dbe319e6e0897198689ee57 SHA-256: 8b658a2b9b67b559a8088b892fc58f5044e3ec578f7f73394d62578077edfb39
176 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, with multiple URLs pointing to compromised websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of hosting malicious content on potentially disposable or compromised domains. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, although the document body is heavily obfuscated and does not provide direct textual evidence. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://mayersoffice.com/userfiles/file/lejewiga.pdf In PDF document text
    • http://ptk-tent.ru/userfiles/file/18966460130.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe489f01ba---58280262711.pdfIn PDF document text
    • https://e-room.co/userfiles/file/95372516252.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/vogudenitegapofizok.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/37372577864.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/66530533374.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/rexomilu.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/relopo.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/kenixirebiluziz.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/firawanikopevokowawif.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///11722378430.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/22241353606.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/20768268115.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd91be0317---11685657374.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ta08va51c972sg90gvkq0iq500/kugapo.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/84644609601.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/waxonibiwoxefifoz.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/59469838482.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/mivafa.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/wakiwuwudu.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/4757299024.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/foxereraruneb.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/2097685055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TSvcnjQ06Jg/uplcv?utm_term=network+information+theoryPDF 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_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 10536 bytes
SHA-256: ed91cf456affafe49038a2e3342e401e39843fac1d84599472263a1ed75cec05
font_02_sfnt_off00013ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE5 21792 bytes
SHA-256: b0ba7030e47c5c975bc434b5874210f940ac65355f08f787f3518047a25a31d4

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