Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4a011e2a57e8eb…

MALICIOUS

PDF

65.9 KB Created: 2021-06-23 15:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 285f3268d9bca7457228ec1c855b99d5 SHA-1: 3dc7bf761f5bdfa2e1c4c01c80b570acd2178dfb SHA-256: 6f4a011e2a57e8eb53833bd7d553dabce5c917c1060d6cad02045c40c60ffe28
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be a byproduct of the PDF generation process rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/b02ac6c5970253c374c7f67ddbbb3fa4/51042278845.pdf In PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2295638f7b0b42d14be583590000585/78911882559.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b0d4f1211548dd127474b578c67c0c7d/64294010986.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/vofirojiv.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fe3601858---74724129841.pdfIn PDF document text
    • http://chamdure.com/DATA/files/90072672709.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d77cc3a604---94487040729.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/57613773058.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab405701f74---96185430689.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59c7017cbdfcbdb999fe006dc4b5cfcd/givezekuloluzejexenujasa.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/wupezonofotinurami.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7d07dc470860a0417c3fa298e481f7c9/89774514098.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a024d42e571---juxadumamoxipejowipubul.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/kunoxopuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=paryavaran+adhyayan+erach+bharucha+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB83 5336 bytes
SHA-256: 955a86b1dacd3b3dc2d457813a7e9437222a7d955bb3971364d42547f0710062
font_01_sfnt_off0000cdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB1 14568 bytes
SHA-256: a739f71bb0b157459c56f3e57464b708247600e369c2fdf066e9100e53f4f041

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