Malicious PDF — malware analysis report

Static analysis result for SHA-256 6006ba27026cda21…

MALICIOUS

PDF

127.9 KB Created: 2021-09-06 10:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eceec0eeeb55fceb52564ee13ea39869 SHA-1: 44d1771eacd6285dcf1c5ebcd34612e30de297e0 SHA-256: 6006ba27026cda213bac8c515811a98237968efb4da9341c79c505cb143d440c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9774

Heuristics 6

  • 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.
  • 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://sogelec-eng.com/files/ckfinder/files/vigupurigo.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16074654b6d9c1---sizij.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/junigegobezi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/85206553751137901965ea523be6d963/firomubofotuxajuko.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/tadamigate.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/74ea6dd47ceda136365003ca21d3f049/xuxipuserebos.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/24793157355.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5508d4cfff---dodumugubutodirilamivilad.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/68294741365.pdfIn PDF document text
    • http://hydrem.ru/images/file/zegejunasamusugakoko.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/setusimafedigozava.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/mifilo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/09e0fb3dc11b9f3f932a5cf37df41030/83744710096.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/5tvt06ot7unub1ms1simlp41i7/75349122948.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/piguzuwanesazibonolu.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/33887701122.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/cc55d9da35e92f0328ed43db8f05169e/negisapuzovak.pdfIn PDF document text
    • https://ka-base.no/images_content/file/60895854804.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2108270652559563705pubkw.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/jajaduxabopakofimeba.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/80837704508.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607250e9e1c02---68309678824.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/malenolinemibajijuta.pdfIn PDF document text
    • https://le27.fr/docs/file/labutabigufod.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/bunofubo.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/nbjht3maq7s532gndn19ssr09u/85615580978.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/diwawuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=zohar+pdf+5+tomosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001708c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1708C 10488 bytes
SHA-256: dbfc47b24e27c8abf4db0bffc7b4026047a3b9ce3fb754d4ef702a31369d953a
font_01_sfnt_off00018872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18872 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_02_sfnt_off00019de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5FB 23072 bytes
SHA-256: a6eb184f24ec10f39076d8c45ccda8ff38fac4fd0e2b7df13a708ed6092f85ec

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