Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5f5b9cb0dcb64d…

MALICIOUS

PDF

100.7 KB Created: 2021-09-05 02:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ef93b532891cadb4aa35071809d273f SHA-1: 7e06ea6c1873bb4789e4ba3763f875d0647a64b4 SHA-256: 3e5f5b9cb0dcb64d01cbdb86ef00060cf608f879d243acc6bf30fb0e44f44598
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised websites and potentially disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://queure.ru/uplcv?utm_term=democritus+atomic+theory+pdf PDF link annotation
    • https://parvazyab.com/basefile/api203/files/12887356036.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69753c9c25---8114314714.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/141037d1bc91df00d6a6713dad5ec1fd/82761170471.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/58003298589.pdfIn PDF document text
    • http://biatlonbreza.sk/editorfiles/files/nasonaboputiwuda.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/rajuwekovibev.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210613_155857.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/28478061364.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/1674459584.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/19875570768.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9814215eb---mesenagovil.pdfIn PDF document text
    • https://ijpdua.com/contents//files/zogogupovixagopapiwe.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/76217489590.pdfIn PDF document text
    • http://koala-al.com/d/files/lawipipavibobozigup.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc99e9410---fixasijafaset.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/25380044821.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/xugusezadisuxi.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/76989791909.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/57783286922.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/591647a22d266ffaae7e556a2f2d2151/59236452067.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/33494625077.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/wibolukozofusalekoriz.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/toninonuxusikobajizoz.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/kidotofixema.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/sepunexuxorezo.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_off000123ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 10952 bytes
SHA-256: f36508a9e64df748cb7496c0a6149031fd386a9196c2d918d1b8498a9c548049
font_01_sfnt_off00013d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3E 18456 bytes
SHA-256: 7e9a3d5a3858d992de3a9d39b6f1a61cc147b89d5f461cb5a2633ae6148dcab5
font_02_sfnt_off00016cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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