Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a08336952427a28…

MALICIOUS

PDF

69.2 KB Created: 2021-09-23 11:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f6a80850b311b1ebcd189ca7cdc42c2f SHA-1: 8714aeac04a7519e1369768d4061c78e1e96d4d8 SHA-256: 9a08336952427a28cc167cccfc18bb48227d63649a68c7995fedd2e8e6a8a3dc
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 indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to compromised websites and disposable hosting, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs suggest it may leverage PDF-specific JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=the+magnificent+seven+streaming+free PDF link annotation
    • https://www.retake.dk/ckfinder/userfiles/files/10087643655.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/dopiposugagamusedufasito.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/th0d9qrns4d7630fq5ad5nu2t6/xovezi.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/21486485675.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a908d2555---pexofijiteb.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/tubaposonanapotiz.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/gedizonagakemudorizobe.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/19863496088.pdfIn PDF document text
    • https://managedentalclinic.com/ckfinder/userfiles/files/wokegu.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/8988994903.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/jajugereduv.pdfIn PDF document text
    • http://www.polni.si/Images/files/70771862753.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/jutiv.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/lakileg.pdfIn PDF document text
    • https://keongracun.org/contents/files/wevejimulevidogozinavolu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/leboviwewasuxemokunoja.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/jonusaganidisum.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/pesotig.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614033cec367a---rexuxinexelamokufafekor.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/sorevusigazutivudutipuv.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/14489533343.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/51631030499.pdfIn PDF document text
    • http://asid.rw/userfiles/file/deguzapopugi.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9669249f---39513359341.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/46975834430.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_off0000b22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22E 10648 bytes
SHA-256: 355af43e50a6a8d5086071a2b8cd8649b082d4975634fea20caa908152035631
font_01_sfnt_off0000ca63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA63 14800 bytes
SHA-256: 3ef5a7e2aa70a4a8460324d6bf5c86131e82be2b02dd309741c3f4064c9d480a
font_02_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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