Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c163e6759bfd3a…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 02:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: faf815caaa58d877c1dd26f4bb439cfc SHA-1: 62af3ce78aac2134162e96fe2606357f6140802f SHA-256: c4c163e6759bfd3a2c7b2dac33cda663054f8a4a1186312093fdb2843d80aac7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to domains flagged as compromised or disposable, suggesting a link farm for SEO or malicious redirection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wickedcheesy.com/images/file/86196679647.pdf In PDF document text
    • https://nedimgame.com/calisma2/files/uploads/82282681232.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/34581519444.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/nemikoradazowibukuwitu.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/vopobonudivitifidemafis.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/21525157561.pdfIn PDF document text
    • https://energooptima.hu/upload/File/nedakipegokeloma.pdfIn PDF document text
    • http://dzbnf.com/upload/file///zodage.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/38255608094.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a16d2425856---88896430092.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/fazotamebu.pdfIn PDF document text
    • https://kopari.hu/files/file/13734827928.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/tumufomakuvavokajenese.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a420055ee6---burajudeje.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1ajkbrfsresmqe89eo4hn2k5i7/31982094997.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3561a3506d37b811afdf90a5b55f308a/nurigojapur.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161131dd6d1559---87582503420.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af8bbc79a01---67830673630.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a1033f87f332998da7974d65d0966261/suvunejunonakefi.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/20366956743.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/28nm7ofhnvd6ag4aksin33h3ql/mojov.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/4339d3ab5cb1b50af43607b8bdf28044/17601657279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=reflective+communication+worksheetPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/nejisikaxijufumosireb.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_off0000bb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB98 10992 bytes
SHA-256: f4e7d6be69a2f8cba98c268ef3867403f9d56181f6d1a12c8bf3ae39756e0a08
font_01_sfnt_off0000d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 15920 bytes
SHA-256: 3e42d466023724bf3e738a5739b3c012c86f950fb0eabb8b80447e21028fb73c

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