Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e9df33c519ae89…

MALICIOUS

PDF

71.1 KB Created: 2021-09-13 14:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: feb5566f860063de9a00e04df6c15d20 SHA-1: 0c1a80eaf94d64a14f81529a38c89413466b506d SHA-256: 08e9df33c519ae89c95248bef567c594fce1ddf62d3692e8b0fc83c9e58849f9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of a Google feedproxy URL with a 'how to hack' query further indicates a potential phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://jinshi66.com/uploadfiles/files/piwofibenupajux.pdf In PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/susifufetegupunatonaru.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/79688572316.pdfIn PDF document text
    • http://samtekelektrik.com/files/javodoxobafagusiwif.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/5026988356.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4783a1359---78283200187.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/teduwomabotujifeguraju.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/bewefumez.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/48757095391.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/8437741668.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/58230442899.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/44260043556.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c51c8d8ef---zifeluzamesixi.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210903065553.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210903235204.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/zofikeniwel.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/83782218020.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161360dbd7c259---81661840964.pdfIn PDF document text
    • https://renetravel.ro/images/files/40473581958.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/musisewixuwoniraxarosus.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/rarironiruzaxefuxowedad.pdfIn PDF document text
    • https://www.confirmedtour.com/files/xusuz.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/nowivunafiwesunibopofex.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/robodilafemiwaxira.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccbe594004---kagumuretazumekaboje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+hack+a+roblox+account+on+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_off0000b906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11D 10680 bytes
SHA-256: 52d4a589e02905e3e787650177808bca99fc58f71d6e6c5715f1650439439787
font_02_sfnt_off0000e97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 14888 bytes
SHA-256: b290dd17448c76cd30d366744dd8eb396cc87f701596e7de992fa41eab6108b5

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