Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af4f96f5ad16333…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 01:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57206c9ad3b509d81e734dcd7fde86d0 SHA-1: b9185805c1ffcde963f59c33541c67fcfe8dd12a SHA-256: 7af4f96f5ad1633318b4b18e7cf68d7c3d3aea339131ba51394a45fa3f515a6d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites, which form a link farm. These links likely serve as a lure to redirect users to malicious content, as indicated by the ClamAV detection and ML classifier. While no scripts were directly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirects, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ds1cohqjo2djm07j88i3u1d25j/rexamoxarilarogosix.pdf In PDF document text
    • http://kwong-cheong.com/userfiles/40175952817.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7jf08ss91pm2vcglm2427ok6aa/rumufepafetimowabizari.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/davexunokusag.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cbb17dcaff---jipox.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/zonegovomukefamerok.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac139a3cb---kovagifijezax.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/noduganomojemes.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4a62f3d0321b485ffe05b1117f8b9f45/sipimo.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/jidobawogolegunibepan.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7cb0c871bf---nowonaguden.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607194fa794d7---45207137056.pdfIn PDF document text
    • http://iwishop.hu/file/zuwadavivaxuxuxex.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/74470983753.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/34353862320.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/28489744136.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/646ed9c89234a64e4a43a37f82f99282/nuniwon.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/4bd0097cc1c38263419692953c828871/kavabimojewuf.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/ridomekeduzakumiginumas.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e554c865---libajuxe.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0s550duj6bpig58735jnevjui7/fegof.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3ba99a3cc---danironajetaxojivap.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210713130815_1953514529.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/suzegexo.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/s9t4fk3cilh78d3lu1qkq0eaaj/menezutuxovigudokarisipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=interpreting+definition+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://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_off0000cfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA2 20584 bytes
SHA-256: 2159f34303d79e937aad49a42a6a47f04ba374c212481db62dbdc69ba70a8684
font_01_sfnt_off000105f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 10248 bytes
SHA-256: 3e1193427a2d04c12d2667c7d1651f083cc10ea94c56918bcbac353e2e4390fd
font_02_sfnt_off00011cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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