Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1671a9d4548014…

MALICIOUS

PDF

68.3 KB Created: 2021-10-05 19:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9309a3aa33f737547b09a9fe5c78e8fd SHA-1: 7f890df21e4c7ffa2a16134240c004de882f5dac SHA-256: 7e1671a9d4548014d1131b9c7d46d74237c050d1a3b8e1068400d8cc160e7925
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external resources, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically as a phishing or trojan delivery mechanism. The PDF's structure and the nature of the URLs suggest it's designed to trick users into downloading further malicious content, likely disguised as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16141f2f38fe81---64517945157.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403a963e648---sataw.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/kurire.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/samubobipifadosexafudipe.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/bodozogegalonogaweka.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/zexejekekarosipo.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/4819537009.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/menejafikaj.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/gezixenewufij.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/20653038519.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/tafixaralevijogu.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210908062910-80771172015.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/36921780020.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/43023091883.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/26343743558.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/52602246798.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/gu5u69ali8m3i6he8p3dgc80vr/muvunodekavupukasudamasal.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/89702088665.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/2749145941.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/sitemugidelubefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=impulse+response+signals+and+systemsPDF 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_off0000ae94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AB 10900 bytes
SHA-256: df8c826044aaffd9e7d60056fe606258dc0ed1d9996b6f62cbe9994331b665a0
font_02_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 14344 bytes
SHA-256: c2d83694476bbbdc08fd6a3c9cae56c18aab0fc6c1ada60c7fe1180ec29e67dd

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