Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca41bfde641dd57…

MALICIOUS

PDF

71.6 KB Created: 2021-09-02 05:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 667949bd161b38325d9b3724978f0263 SHA-1: 24b344c4ee35127298a307c2b62b57644a83010e SHA-256: cca41bfde641dd5789849bd6c9592ad705135fd731c877e7ec6ece252fa99986
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 upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=cook+egg+in+microwave+ramen PDF link annotation
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16100c90fb3707---jejamumek.pdfIn PDF document text
    • http://suurelepa.ee/data/file/24296118794.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/39837457204.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/75621482932.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/g59rm87u6b45jojn48etlqsif3/67682470293.pdfIn PDF document text
    • http://foxhill101.com/userimages/4147133288.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160856119e99f3---68890009652.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/mavevizub.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66d12d6d3---43074574538.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/md56k94agbr562pjtcqaublc50/57451889893.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/2045890443.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1627087538.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/sevurunelisofufuvezowos.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf51896791---niwexire.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/36831122566.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/ab796abbc928b41baa0abd96ac18aaad/29218589488.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b42cc4304a9fc8dd53e7f4960c2453f5/50547940789.pdfIn PDF document text
    • http://getem.plfiles/file/88366778858.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc60698a9a---sizujuxev.pdfIn PDF document text
    • https://coluer.ir/documents/file/8582505340.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/9459077444.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/42f707ccca9fc0057881ba8b38342307/71963683713.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8017dc3f7e---gomomupunatexaxogujogose.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1f4218cf5---jozinorup.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tiwumeb.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_off0000bc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42B 10536 bytes
SHA-256: 08792e966baa5b5263458ddb4e4b99331c7958844eaa603bda133b7493b542d1
font_02_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 15064 bytes
SHA-256: bb204c54c054afffc89ad57096641b2f69087b06b61678e0e64498307959661f

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