Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb349e50ad083910…

MALICIOUS

PDF

89.7 KB Created: 2021-07-19 09:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2a5adbb16336faf47abb8ece433e9233 SHA-1: 8400fb1414298720817ff4d7fc47d1903dee1eef SHA-256: cb349e50ad08391060a0abe63f417f8a04c32e131cd8bf8410a334ab202efce2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript, which is often used to download and execute further malicious content. Additionally, multiple heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites, suggesting a distribution or redirection mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b71489da9---fizigepasepidav.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb93cfe12---56934165388.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d9f397064---58717116471.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/tujajufovale.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/pemumirokileranadez.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37632082207.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/zasupunogageximafanazuzib.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/39952f7089f774d47a73e4d66644d0c1/sipisurusugel.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c10164dc5---33089129399.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/vavalijovodafabitaxiw.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/xunodoz.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908747eb10b---dexewugizowedigifafaguni.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098318840683---rogevemujokutatidamuket.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/48191673030.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2e26cef9b9e81b88f67d68d65159e77e/xibulenaduzalaw.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63da42b9f7---96775755300.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/refiremukorumikezubutev.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/60aec2d605c9a01cd8b478d76a7eb7a0/65189561374.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/mebarazedebolu.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/wefuzuruvojanavawufimem.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6026031e5---59010890006.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/rimukuwexulanepafa.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/87126591942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=introduction+to+computer+organisationPDF 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_off0000fa85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA85 17592 bytes
SHA-256: e36f467e104360a20f45f15092c87c888f352b0757b9b80b474cb2e999a177df
font_01_sfnt_off000128ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AB 10860 bytes
SHA-256: 018b7af97ae785ff79e14a882382919f16b3ef9b76de2fb421696185be04e4a8
font_02_sfnt_off0001418a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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