Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dbad067504e6a3…

MALICIOUS

PDF

83.5 KB Created: 2021-08-30 06:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ba2358c5ed723c32870de9c9f18cc03 SHA-1: 5034124bbb7a393f42f420c6dada00d817836e81 SHA-256: c8dbad067504e6a3b33b382eb3b8fcae2e5178fffb2647a0ff5656e54dbf3268
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/uplcv?utm_term=is+it+legal+to+have+a+pet+wolf PDF link annotation
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b29405df2---37351448625.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160980e4c11bfa---62806955120.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/46324821108.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/sukivirovuvel.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/67937810112.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/33533788627.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/tinibamebanefukusive.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/12267044337.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcaf5c926f---43616892500.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/wodurato.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84e8b7923f---lowepaxijapipuweli.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d80ddd1ad0b---denunore.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/90307686527.pdfIn PDF document text
    • https://akemi.ro/hirek/file/37722756404.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/noxedatolekenolak.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c8defb884d5---55910926337.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/bufefojunud.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/43871208429.pdfIn PDF document text
    • http://quinta.cl/upload/files/vatoraloxuserok.pdfIn PDF document text
    • http://grimastone.ru/files/zisim.pdfIn PDF document text
    • https://kede.org/userfiles/file/86672200501.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/lomazejavisetif.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_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 17352 bytes
SHA-256: de6655c93837c789cc3743bd198ce117fdabbd785b98fa0f042e38e45420ad01
font_01_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 10536 bytes
SHA-256: f5f424217102d423e9b05e0601b17cf36d29f631167e76e3b9f5135596835b78
font_02_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1