Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc40d7bfb64a7769…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 02:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b9b2f63813611cf797ed58cec820010 SHA-1: aad3622e4cd4521bd4bb2cec07381659d43039b5 SHA-256: dc40d7bfb64a77691a17b3ff3dd413f489a761e5337cd7f5e7526ce9d78c4c0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a pattern of using compromised infrastructure to host malicious content or redirect users. While no scripts were explicitly extracted, the nature of the links and the overall detection profile strongly suggest a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=linear+inequalities+word+problems+worksheet+with+answers+pdf PDF link annotation
    • https://timjanen.se/anvandarbilder/53/files/pukejenuzelifoza.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/kajowoxezejawop.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/13220894829.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/zenemerodoloxumit.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/sivomugitonowupepelilipem.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/pezonivopijexovomegenod.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/29536927101.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/0e6e768845c6121f829b90c86c9de18d/zikulevoxubaluwowe.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d30a2018bfb25c8b01cbf4a118275e5f/33024597975.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/forakuzedusegidaparom.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/lbe67lrb9t3amsltdt23b87lfi/53193466597.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/5033019205.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/tunivifosezopuxofagodenuj.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/sasuwakuwevadigezed.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160724ccb01c58---wagenopul.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114d21f74272---14533202126.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b8mcqltos9hgurhs26d88mlug5/97306980089.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/tuvikinikatopowunudipava.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/tobujadiniva.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/jalapaxojoxiwetew.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613546638d606---82006235074.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a3a7ec174a04cf6719919ae727a7ca9/fuwaterubow.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/tokitoderaji.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/27564124366.pdfIn PDF document text
    • 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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 11284 bytes
SHA-256: 1b3fea0b5a1f6702b74efaff83f78a23e4b61de00fe384b0b46e1d6ba6077107
font_01_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 18344 bytes
SHA-256: 8d3e3bbd9719fe63f791ab61f87f77de8cc4b3175b4b422f9c067cd9345f31bd

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