Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71aa78b8e3e6d07…

MALICIOUS

PDF

75.4 KB Created: 2021-10-17 18:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d19b09a24ff4ec3b50df165d1b725d92 SHA-1: 06462be249b7169020428759e103b032631dcef9 SHA-256: b71aa78b8e3e6d0710b52cd0b9462c2dbb49764df96180d7d5d6770f835696f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs that form a link farm, likely intended to redirect users to phishing sites or download further malicious content. The presence of JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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 https://inwebjor.ru/uplcv?utm_term=chemistry+notes+for+gate+life+sciences PDF link annotation
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161357b8803524---kobunada.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3d5fd196738c17fedf174aa027b52172/weputalizupa.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/wosafexa.pdfIn PDF document text
    • https://arhiapp.web-idea.ro/app/webroot/files/userfiles/files/zaxizabemanasewebo.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/71552961315.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/18525748323.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/xuzatenave.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/eb10f661b17b80c15f4d45074abaab25/81395435964.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/luribudikegezirebopim.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/rebuzixipevodolubuwemi.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/20413559665.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/72145055574.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/fewemusufiv.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/lujubafenexopo.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/76456239134.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/40568948933.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16154288d1d6ae---tabubokuzasevarunax.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8f077e87b---2986584160.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/76111080566.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/2lb5fb9rcm36rjd9dedfoho75hb0no44/gujatavujinejegu.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/dokoga.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/temelavetegaja.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/jolirivemubal.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/60909596835.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/bevenuluwi.pdfIn PDF document text
    • 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_off0000c3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BE 10928 bytes
SHA-256: 48b7fd1fda26016ccb3a527f1c81f19e1d0cc825c503c8d2f607c529b0620042
font_01_sfnt_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 16584 bytes
SHA-256: 3d4b2f42b7eb8202f20d0276b5970a0294a5d18c01cdc0b7ff431761a5d8a090
font_02_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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