Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9edd2efc08946f1…

MALICIOUS

PDF

92.0 KB Created: 2021-08-02 21:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d161ed0a937f9cdd3b9d2af78e3fbf4 SHA-1: 6cd9a91226ef68ca5617ca85289db50c72a26afe SHA-256: c9edd2efc08946f1c7c25e7d9dcb8ce78bc731459107c6fd9d4b644ae5257813
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d092204b141---23877665426.pdf
    • https://samuelben-horin.com/userfiles/file/rerupubal.pdf
    • http://nhs1980alumni.com/clients/878257/File/bekivudufatikalazogu.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bef93a50ac3---wexoxidokufabu.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3a3053a0cfae5d240054c708d869a2bf/fapamizexedutosol.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f527e2ee5d6---sibuxavitotetokugowaj.pdf
    • http://vintageguitar.ru/ckfinder/userfiles/files/wevovukejakirijizo.pdf
    • http://lucann.com/Upload/file/62801957983.pdf
    • http://donghobaoan.com/uploads/files/26839625562.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/637229df5c1ddd26c2de69f753d50509/35575670413.pdf
    • http://ecohouse-lab.com/userfiles/file/lemewurogivadowir.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/pumubajewuxozaxufis.pdf
    • http://ajtoablakcentrum.com/_user/file/76472281746.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/082215195c4ed538ea33ec9088bc81f9/92039018979.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/bce9fe79b61a9e879c8d61fe11007afb/17353200481.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a760b4ecc1ec70232834039bfcda5be6/57275358339.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b622815be56---lopozikimuperoperuxe.pdf
    • http://elitaliaweb.it/upload/file/11117408345.pdf
    • https://appchecar.com/ckfinder/userfiles/files/pokitamafonenafasozaken.pdf
    • http://aisef.org/uploads/userfiles/file/file/33585985172.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14cf1ec2e9---poxugimis.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6d56e039cdcd3aca97ac29eae7a9029d/64090274980.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/pjr35td6i6rn39tvr1rb953uv6/xazoriviwet.pdf
    • http://streathamtaxi.com/survey/userfiles/files/55184077468.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=lista+de+verbos+regulares+e+irregulares+en+aleman+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 16792 bytes
font_01_sfnt_off00011586.bin
8b0ff09f0cab307028c4d1e41c944cbaf01810bf058169d34079cb7f9142445e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 11104 bytes
font_02_sfnt_off00012ef5.bin
84f6a90082b6fa52b57001b02e6ed8cca262910f584dda05061e227b454e1864
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF5 18956 bytes