Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6781fc91138931…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 05:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 14cc35608af02579c9aa57ef40986938 SHA-1: 3f9768164aceb03bd6829ce9df2cb2e213fb3c40 SHA-256: 4e6781fc91138931a1d574cb6f4cd776c2032de2bf1d13736d854dad49bdd881
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised WordPress upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of embedded JavaScript, flagged by 'PDF_JS', further supports malicious intent, likely to facilitate the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://gazosilikatnn.ru/uploads/files/74246771548.pdf In PDF document text
    • http://easyhypermarket.com/userfiles/file/dotexexinunala.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/kipud.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/89638758839.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/25844159374.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/52643165093.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/nogewogofisi.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/lerelapiveviwiwatifeme.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/66462083866.pdfIn PDF document text
    • http://lachina.cn/upload/file/63213264925.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/56216558672.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/vosugiromuna.pdfIn PDF document text
    • https://everestart.com/images/stories/file/93901648736.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d801a28f66e67f01f77ea6295e71e33c/zodorisofe.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/texudovenopakam.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/gerekitozej.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/29666638733.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/6579257626.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338c6daddc8---kusabenagonilulokad.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210912_095221_160.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/seremenowasetazaduf.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a4326c23---82699132813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=new+folder+in+androidPDF 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_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 18152 bytes
SHA-256: 17aa1b31bf7c5bf44a74b367b4aec8f9d4b4eabe33588658b0f593bffe1c4cef
font_02_sfnt_off00012458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12458 10144 bytes
SHA-256: 8a9576082dd1416550c2b7a88927b854f0de8ae97f2b0ab013c57ff7894b3307

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