Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ef3f285d4669ab…

MALICIOUS

PDF

91.1 KB Created: 2021-08-06 20:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa5c10e832122faa36f4025b3800ec9b SHA-1: 9cf2a4c20aad3a5f1ed792a81cc29b90b51ac5a3 SHA-256: f3ef3f285d4669abb2f6652213613b9a19167060dd9d8eaabf917ddd4d1717d6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host malicious content or manipulate search engine results. The presence of multiple distinct hosts and a high number of links per host indicates a coordinated effort to distribute malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a966b4a3156---97634002502.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/m4t04sqhqk52e1l39osh7q0nj7/penidolesidi.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210626060648.pdfIn PDF document text
    • https://ahha.az/userfiles/file/fabalimakifiradunajixo.pdfIn PDF document text
    • http://premium-t.info/files/files/pasasotifaxofawu.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160803af0523d0---dudodak.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/2qmvmqkahg1pmuosta5k0ou0m1/zarorijatafoxo.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/lizaxevogisalilexikinoka.pdfIn PDF document text
    • http://idcla.net/upload/files/33713292165.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f41fb692d---sutawediwomesiwuwaful.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4153e26ccf---nopirazisoxav.pdfIn PDF document text
    • http://samtle.net/ckupload/files/dulid.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/468362fd4af4e9394ca94ed199ca6d37/11832336907.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b773bd94be3---6369971436.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d3db475a8c9---rulase.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8d4c3cda6e86ebdce181f8ece5ac3243/rofogavogimukegot.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/8969711681.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/97518921439.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e33e04092c9a91367e1c90f3c1084bfc/sefejejagapekibebotuliwem.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/jerekem.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc411a2b6---93827963581.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/75903704888.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pu82kfpnaujul9kem3d7tcbfdq/tukavokisibub.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/tvnkf2flc5thcnakhtnruu92ct/roleguzugik.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608426c186c6c---garinari.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/1b47897fd61ad56772715cdabc7f45ae/17477791817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=where+is+telegram+data+stored+in+pcPDF link annotation
    • 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_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 17848 bytes
SHA-256: 70b3aea5b293d4eef0ed567d904011fd9f1c5294faa8315658d96c749fe7e0de
font_01_sfnt_off00012c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001446c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446C 10956 bytes
SHA-256: ee09c40218faf64d528f6688812d9eb9d2ff1882331b73c16a0bc7764b5f5f61

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