Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f87fea5efebc63…

MALICIOUS

PDF

78.8 KB Created: 2021-09-23 02:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c9cd285d59b5148c2bf5a7803516323 SHA-1: 287995afaacbb7791cce5fe7f3675746fcf8d945 SHA-256: 97f87fea5efebc635d9382dbbe0f7ad288a818f50fbbd2f704de6a103420296a
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host and distribute malicious content. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.peltonfell.org.uk/ckfinder/userfiles/files/maluwava.pdf In PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lelovifipozojisibi.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146ba539048b---42524085844.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/71094264241.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/65421714972.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/xedop.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/rezajososirefefibe.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/cc77d79dbee822d266f3afaedfe24a02/23749122167.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff71801a2---pakebisokajelamifeb.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/fubudumizifukomevob.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/13291754362.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/67596733038.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/vomezubakegavepenosak.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/69230597025.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/vujekorusevoxujuxoj.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/66999982687.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c13e1031d7---37457727629.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/xokipusekazum.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///56878334044.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/17398248334.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2e8f7c324---vuzazepepumumidenipilarix.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/15780851754.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/m1mn5o3vje81u0pampfmunna74/kipanujafer.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6f4e0956---vebunuvodewebudixajujawu.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/69072255633.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/97051148934.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9cf3f021f---sogapibewudirifaxomimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+black+2+download+drasticPDF 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_off0000cd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD35 10968 bytes
SHA-256: 1ab52879cd490d6b5ee5ec422610f690ffb52aeb1fef1093a2f4b04b4412dd44
font_01_sfnt_off0000e6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 18032 bytes
SHA-256: 6e55e19ce96953900895a756f380379715447b16aae172096b6d5062ed0f4144