Malicious PDF — malware analysis report

Static analysis result for SHA-256 4249ad79f3b9b23b…

MALICIOUS

PDF

87.5 KB Created: 2021-08-04 00:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc81c05c224bf9b42b68a5823f08902e SHA-1: 14693162b831c657af763811657254b380b15733 SHA-256: 4249ad79f3b9b23bb368f3a9d8993942f5fc26a46a696d0edd3e2b3433caaa0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of multiple external URIs and compromised CMS upload links suggests a tactic to leverage potentially vulnerable web infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ac7674b6da362b3a6453374e3006cf24/lamukarejomubexeb.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7d34461bc841a19396fdefee4c6f56bf/morudupasegavasaruxixedep.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9of3vta1ocs7kc5dbfa28boau0/dekib.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/80998437395.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/59891140595.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ffgf7b0abkckgvon6fh2rdbuot/sidevewi.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021060605162073499.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7acdb7b0b---zumuzarogoxuza.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc81d67bbc---2161141094.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/88698488507.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/musidasew.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d0b2548e7---48753545321.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad9f13dd0---419274818.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/manuluzavixuf.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/94985455589.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/73036947716.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/2477872878.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/38407164985.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/bagabiregufivipaparanisan.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/92439936721.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfd71193ca---48111468593.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858172a9ba4---3743628162.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7863c59e49---wudipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ffxiv+how+to+delete+character+creation+data+ps4PDF 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_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 11024 bytes
SHA-256: 957aade0394e3d62388e5e25445dc97d2e2de8478e0e8c688a2522fdee9386e5
font_01_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 17808 bytes
SHA-256: 8b0c9e9499829ccf82ad0807c00438489fdcce9ffea955540511715ec7cfedaf

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