Malicious PDF — malware analysis report

Static analysis result for SHA-256 5849e628c7d75848…

MALICIOUS

PDF

86.9 KB Created: 2021-07-16 19:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b2c9ce751fd46a751d225920af652fd SHA-1: a6f6d2dbf0618bb0e8092c2cf4dbb47483ebf73e SHA-256: 5849e628c7d75848325f098ad279b84072a2ccaaacc7e1b729ea32361febb55f
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 CMS upload directories, suggesting it's designed to host or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/75ce8252916ff6dbe57cb40b92baae88/mibaxipenilewilupi.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2e3e2a71a---bevajuxasos.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/desafawakefisefifamarixu.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/xumegevodigiwusonodon.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/fisikukujulu.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7cd2c1f9f---47081540659.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/52857003707.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/6ss91d98oqidc4ajlfori9s78h/giwuzisoxeboludegunem.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/73441162407.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/cf35lrmeetqfit8jfc6dn7960t/vowadox.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/zawavajupowoken.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad02b5efef8---bajusifubobizizipene.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e842060128---sararojunizagarug.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3100f6df90---nolefutugekenuxer.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/a894f94a661faaf43b5ceb26dd478a26/tuxemana.pdfIn PDF document text
    • http://vieclamtaichinh68.com/upload/files/fuxetodujifodof.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b1be0a9a5---39712171728.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f5e679d13e46f0f74d5380a2793851cd/14744712566.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608049d22a251---purasegivowiwazufonep.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071f6128cb1d---53700628458.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/24115403874.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/aa333adc4bad130885aa854cdbecebb7/jasorozinidoveloge.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/56f09f305b30bded58f3d7d32690f3df/65432453528.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/mirojogunifuxuwugevobuw.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd82d821286---21615952883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+cook+pre+cooked+turkey+legs+on+the+grillPDF 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_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 11016 bytes
SHA-256: 238065f73948fe92f5f06a474c38717e38cc7329ea6b5ccf81cf60fb4afb9420
font_01_sfnt_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 17468 bytes
SHA-256: a3ffca3bfdb63b72f4fb068e1bc46010854f1051c11302c605a86e1f2dbd0989
font_02_sfnt_off00013604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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