Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8a77eb67083b99…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 11:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7751b1db3779d40e3423601e95ed8f5 SHA-1: e3c4e02b380d4f01be9159226d0222ae43c95b34 SHA-256: 4d8a77eb67083b99dbebf76a2dc8de125ddcd4aedc34a38a16fae16ccb743c09
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. The embedded JavaScript may be used to further obfuscate the malicious redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://catamma.ru/uplcv?utm_term=pdf+crop+online PDF link annotation
    • http://arebiatours.com/uploads/files/pibepemalosilujefekalol.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/ridotavusuxigaseme.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/41bc85714de198d2336b5f75d664e35f/86895671737.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137da286ca80---zejoxajoxe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404a8997858.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/zujaxabi.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/10023731919.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/xufavikakumiguwowem.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/semeselezikipelomipotoke.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/91189242975.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/39474821465.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9e19d30c05c06d2fa443e61d66e0572c/wewenuxiwox.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/dikuvutuvuponinajobe.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613456e8bb804---sovadakizezuxak.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/47245d88815e9f1085805f3c0ac0b803/59048346929.pdfIn PDF document text
    • http://stonebreaker.at/xavetamusosuxitokasujas.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/33947161978.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/80049122037.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/21250429352.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/fodevoxotinajako.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/31575957423.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/2011404005.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/wozil.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xofikotuf.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_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 17772 bytes
SHA-256: 7a4c7cbb830b68a02bdb00f000f84455fc946c9e1157cdbda919d3def0c82aea
font_01_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 10184 bytes
SHA-256: b561ed4c80c50c2e26a0f2bc82be3972ecbacfe2153ce6a6ace47bf49d3e0f3c
font_02_sfnt_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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