Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b03a73fab1d2578…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 19:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eef097185e674187b7e768ebcf2afa3f SHA-1: 4066bfa75db5d52c3260d80681ae80051d6f82e5 SHA-256: 5b03a73fab1d2578c9fcb485f4dc0f07b115783970ff43a517ee2a1b712aa9a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c39870b34---zusoxuvo.pdf In PDF document text
    • https://landbondcorten.com/attachment/file/6f45385cb978599dce026b17c26e5ca8.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0db3ca330---xewumutelegi.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/fuzukizivulataxategosisiw.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b7c1a64952cde9c130d5aa943852df85/fekor.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/96cc870cfa78905b7b9a67eb48207c18/fewufos.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/mukunufawowererasirevun.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/piwodaxuxubewazexavugiz.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e07dca7357c32e00fe2b0d3a7d5f1f12/kusol.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/24151834032.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/kamazapuvosekugudakobiz.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/vedugevexuxabivisus.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210901_D9C88ED75B57C0AA.pdfIn PDF document text
    • http://unityproductions.com/upload/files/13409751908.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160900097229d8---83586223674.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1f4e4b14bf9439fc97ef983f339304a9/73238814053.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/kazoduridu.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/11893211754.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97807d3d0---fokoge.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/10223235492.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/90661237766.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/vojatagediraxu.pdfIn PDF document text
    • https://parc-hotel.info/file/9449993036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=climate+change+speech+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_off0000e2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 10876 bytes
SHA-256: 8e18659de4fde63ce6c0250a743bb792add5209b4c4d25bc28befaac5d3c2503
font_01_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 17480 bytes
SHA-256: d645ab8e00c7787df5fe3f1f43e54f2c2988ba4a3178934c286f4457ff07a97e
font_02_sfnt_off000128c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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