Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec49bac5c8fa2311…

MALICIOUS

PDF

90.8 KB Created: 2021-07-22 00:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ce59bf6e772749abe1cbe46c52d57f29 SHA-1: 6ed80854e84f9ab53358f9232a554189e3484831 SHA-256: ec49bac5c8fa23115ee48f55f64f85451a418799faf983a3cc442663603614df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised websites or domains that appear to be disposable. The ML classifier and ClamAV strongly indicate maliciousness, consistent with a phishing or redirection scheme. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common lure for users to click through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0cdba5cb0---63306330282.pdf In PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/binug.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/302358408126.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f51f5d43855---dalaxedafexatuw.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/22b7413442ca83bb912d818ca6ce92c8/volipobud.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/12967622659.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/807cfaa159063edf4ed87beb88188120/80893395299.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e6ed6b72---23403097741.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3ea93a19ee7186d6b96b9478b08c3196/raxudawosofiv.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c4d8ff1aafbaf496c0788cc432d3bf0f/28706150507.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdecde930e---13836954858.pdfIn PDF document text
    • http://ezibra.pl/upload//file/xugevonasodesipifij.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/robuvelobuse.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/14989347951.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3852ae16f---naxodawixegag.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/jololewo.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/14398608973.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/26828569230.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/r1ndtdtsrcnkmtcsst8b1baqr3/22506974855.pdfIn PDF document text
    • http://isgsrl.it/images/file/39356743025.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/lizalozemodez.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m5q68rvvnoqd7no3pt163cpsh5/fibisizetitog.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/sqvnslmmc5fmgrdt5j3tfi248p/tivatumexopirizef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=exercises+yet+already+justPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e9fb321a1162eeae143145ee863bb4df/12118872238.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_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 10568 bytes
SHA-256: 744d7c4e79e80e8409d62bda336b3f1966e4199834edb98564f79ace34820fb5
font_01_sfnt_off000116a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A3 17332 bytes
SHA-256: f1f8bc616fe749a5e2b4309d0ae7a7a38fb07f609ab6aebfa4b4bd4e2bd9a68f
font_02_sfnt_off000143ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1