Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3aa00bf37a23ba6…

MALICIOUS

PDF

84.9 KB Created: 2021-09-10 04:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d5b3402e8ca96efde76f5c3f340dc8c4 SHA-1: 0f473ebb7b7aeb8da3094511c9093f346e1224a2 SHA-256: a3aa00bf37a23ba6bda7cee7bb788dae1aba901133a18b8536576e7f99139a25
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some hosted on compromised or disposable domains, suggesting an attempt to lure the user into clicking malicious URLs. The 'Fake CAPTCHA' heuristic indicates the document likely presents a deceptive prompt to encourage user interaction, potentially leading to further exploitation or credential theft. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://asustainable.com/global/file/49908937458.pdf In PDF document text
    • http://fongyoskert.hu/userfiles/files/rilemejosurunonevodomu.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210909101456.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/42890869160.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210905174548.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/507283a09e1b9f0de9ceaf1c3befa042/66761809654.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/35894523459.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/xazalogojofewevejo.pdfIn PDF document text
    • https://petek.biz/resimler/files/78209738425.pdfIn PDF document text
    • http://seritour.com/rsm/files/punax.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/63376906784.pdfIn PDF document text
    • https://kawanmto.net/contents/files/34863617494.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/42992113039.pdfIn PDF document text
    • http://kasargod.net/uploads/file/fepoferezorif.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/mogexaxefa.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/gebofarosokisuziwexogu.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/zawefokikaj.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/dibagakefasizilebuxepa.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393abc4a6f8---tefunexamona.pdfIn PDF document text
    • https://unitjaya.com/contents/files/89141728857.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210902_1CA582BA9F9C1850.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2c3dce070e251c8c44761f84b54ad000/tosijimuw.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/63589846894.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/wuboru.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/zapesojipirufezisetug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=euro+truck+simulator+2+mobile+android+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_off0000e648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 17544 bytes
SHA-256: 6b471bca2e85edf4a59b61c77e91ddeb7e5f00a98311075eda38bf6de443d34b
font_02_sfnt_off00012bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC5 11052 bytes
SHA-256: b815881f52e177bf743d942cf1e9affbf7c1912a61064d9e0989fd3c9bc5e7e4

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