Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24e1fa5e0b17c8f…

MALICIOUS

PDF

76.3 KB Created: 2021-07-06 15:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 51bc0de50976b967d54ecade9691320d SHA-1: 02f3cfb59bb3d1f68143a8c37f099932afa9f0ab SHA-256: d24e1fa5e0b17c8fdcf2e24a6efb790e4a2e09ebff8899269d627f3bf197d31f
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f1d9f3fe7---61773434698.pdf In PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd71d034b4---dokigituwizuvirofazinubat.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/bnihq80llcn8pm0csseruoket6/20781095528.pdfIn PDF document text
    • http://zuche0551.com/upload/file/kudewonugotefotoxabe.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b327a021021---34350737572.pdfIn PDF document text
    • http://esistore.be/userfiles/file/werupajovelapawafosufepe.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608077c5bd8f5---37747582048.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f176eee709---80256247862.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210513021653541.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f87c5d8594---dopilukifisobudu.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/27610778839.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/13757491977.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cecc81524---sifabodiparupibivoxobadu.pdfIn PDF document text
    • http://15881588.com/ckupload/files/wujij.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/76893982626.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b42a70b8e---zopos.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb3e25f4b---bokugemejuvaxuvelizusalib.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/pirukirero.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e448855c7---35501452575.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3765f16a50---mofetavove.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/dogifazol.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b51ac2f0776---darazori.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/peweliwotifafi.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/lavosumewerum.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/47770474651.pdfIn PDF document text
    • http://tlniurl.com/1m4knrIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cc+chatterjee+human+physiology+volume+1+pdf+free+downloadPDF 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_off0000c4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C4 16608 bytes
SHA-256: 0db8cf7a50047d5466ddfff9220f6ab65e7c4bebda109fb459b4b0b056edfd49
font_01_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 11644 bytes
SHA-256: 9cf980ba36c97ff631208b4f219d851b7c9dc9d3d858c97b5ee028a5d9356b1d

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