Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb4354380b5761b…

MALICIOUS

PDF

91.5 KB Created: 2021-07-14 08:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7681f3ccf169c2e3c26e524216125139 SHA-1: f8e1ebe0c1253c11d0b43af38fe0b300b7dada43 SHA-256: edb4354380b5761bdedc0fabc18eabaaa07737ae19b7de53415c2176597fb316
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive or infect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://advance-pack.com/editor_upload/file/90293912227.pdf In PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/d5c9aed0ff2afee3e71c078c10711204/gegagawunolemigofubato.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/xuzuf.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/tefidebiwovezu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4110733d8a---pelonagok.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/r9odounf3l9s7dg8jitftc3t23/pokosomuzexafajinududof.pdfIn PDF document text
    • http://abpaluso.com/upload/file/baxagewadosexekovudir.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8233dadb5---zibabebasurixedes.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16096428d18591---libiwopi.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/gewotovawonatiguvokoterok.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/bozedokurupimate.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/lejalonuzixujege.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/82e2f6702e402094d24c8ad31d3911e9/59611459108.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60C6B5673E045.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/7588645715.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/68366749897.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/47538439453.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd7228a6e5---63430537328.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/d8c47ce5d3f4ed14b1b7a31c63c9ec26/69102422496.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a926cacc0b---10432444840.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bae0bf9c762d1ae78014ebdcfb0f4b5a/37927481688.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/wodumujuxexogenizulukuk.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/49027351995.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/25d30cb0d75dfbcb629217775db2b315/63207583546.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc60f9c3ee---fages.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=construction+schedule+example+pdfPDF 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_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 16896 bytes
SHA-256: edbbdaaa68cece5fca6330bc5541b9a82e03d5cbd90beb200ab52d9b483785db
font_02_sfnt_off000144ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144ED 11120 bytes
SHA-256: 3b2a121d478eac8ebd44d1feced62a35ed09ba00009ec785851c1aac02cbaae0