Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ba37726929ee13…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 23:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6824995752181714b5d69e80c279ca3 SHA-1: 36dcafb2351bfc00384796fe9e996ed76c766c51 SHA-256: c3ba37726929ee13f96d3769199edf1c4f95f1c225a11150a9aacdec5270f8af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier also flagged this PDF with high confidence. The presence of JavaScript and numerous links suggests an attempt to redirect users to malicious sites or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/3552eb8cacd8fba26f52ae85123fdc86/26096613500.pdf In PDF document text
    • http://grafichesirio.com/userfiles/files/11494036383.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/59930880024.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/47017672334.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/17593893878.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/52039300034.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/gububogaluruzedote.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897f9b344da---63668879181.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/76389650099.pdfIn PDF document text
    • https://agatanorek.com/files/file/reromisovufegomimen.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/ganodinazuxewipotug.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d8ee8b07---23453754425.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/nukokusowimamikaxekutufun.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/lewufitobez.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/21163324358.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a62051848---dajavafemipiwul.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/pmu063ej4bba1qfj9m0pmt616s/burijowaxasi.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/640d676ef40221612b5535796d483237/56939403161.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/33258495455.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/fabalobirofasur.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b1dc0274801df21565497d75bbdf797c/9094625692.pdfIn PDF document text
    • https://andana.us/files/files/jawibiroromul.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091aec4c7fe4---pisolosomalow.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/8133315830.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e937be61ad4f0c83efc076ef2d242356/wasexovegijupapumozusug.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/lilomakuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=les+personnages+principaux+de+la+boite+a+merveille+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_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 21768 bytes
SHA-256: 43cff7e605f3b388bfb366b20e252ce9bcab7d8af9af9407dad79dc9dcc80ca9
font_01_sfnt_off000111a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BD 11328 bytes
SHA-256: 32ef9d9d3542f75db12a9d66f3923422578491d6cf75038520642565d6425ef8

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