Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74b7ea048eb5c80…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 22:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b0dfe99b0331e11c4753e320a7bc70e SHA-1: ac3e82f2d366134dce051000a5e681c48b4c7b1c SHA-256: f74b7ea048eb5c8036742112cedc00c86bcd40523ee3c8378340ac708e102c7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, evidenced by a link farm pointing to compromised WordPress upload directories. The presence of multiple URLs hosted on potentially compromised sites suggests an attempt to distribute malicious content or redirect users to phishing pages. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd980f7290e---9615328708.pdf In PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a854dfaf6ef---20226547370.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57dbbe32f---57191128421.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/xolojisibe.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9abded73399815a423505af3194156b9/nejuwatabogepotewisikuj.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160706b7298f14---vemuvuxefudaruvugiwo.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/gotuzutowuvasudupun.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/rumozam.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da7c73064---63077537285.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/pekekeluvo.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/3912369996.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/87915357185.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/zedawinikupaxoganisu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161180373260f8---limex.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3fd75d870---mepez.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/kt4sbtcaj5l9ktsjm1ekrt4ig4/14298645906.pdfIn PDF document text
    • http://chipgene.com/image/files/20210902_071511.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/worogawekekenuzalugo.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/45006239715.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a9461fddb2d---26502267183.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/62141228634.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b546d640301---79033484057.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4db425cbecea41450f25e645847a69ac/9777336823.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/17683523704.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/jifofurebesufirawitibozif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=true+love+waits+sheet+music+pdfPDF 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://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_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 17348 bytes
SHA-256: e283b108fe37c12cf970c0215c9262119f0a23505375a6a8356fd0c387b8c692
font_01_sfnt_off00010f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F20 10996 bytes
SHA-256: 36891d702cde038a9ae0b1f157cfa1fcfe6c76b8a209b65b6b9cc832a687de40
font_02_sfnt_off000128c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1