Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d31849985ceb39d…

MALICIOUS

PDF

90.3 KB Created: 2021-09-13 19:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1825722eca34874900f250292768dcb SHA-1: 294cfcfa19afeefef0f7696b13d8bb763fff838d SHA-256: 6d31849985ceb39ddb829bae3ea027c9a51b3a368435c213d1784500291e28d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ClamAV as a phishing trojan and contains embedded JavaScript. It functions as a link farm, directing users to numerous external websites, some of which are hosted on compromised CMS upload storage, likely for phishing or malware distribution. The embedded JavaScript is a common technique for obfuscating malicious links or initiating redirects within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • 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.
  • 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://catamma.ru/uplcv?utm_term=deadpool+2+full+movie+stream PDF link annotation
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sepafoziximutosefebab.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/32954633286.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/zogetokisukiti.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161374becd4b54---tunemizun.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/79659692629.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f247be80be---75818257187.pdfIn PDF document text
    • http://orenprom.com/img/account/file/27501519121.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/bujufa.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139cbb5d9075---91373263505.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/wanefeligom.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/pebipegijofepowewekifo.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/weximexomaxekigaribu.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/kefidozivujom.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/fidofizufewasazijarufuz.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/61702057019.pdfIn PDF document text
    • https://duel.pl/userfiles/file/87169019636.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/65675006930.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/514693796.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/xexinomesasabuwino.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/pegukuwivinos.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/29721407939.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135851e0b697---ponelavuzotamozonememuri.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_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 18176 bytes
SHA-256: 4cc4e9b0375d2802035b271d4def9459a8dac8862d40a85a9d6d30f7f9fbdc68
font_01_sfnt_off000129de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DE 10844 bytes
SHA-256: 5af21dfa868073a16aab4ca2d78e4a847d502927cf7304e9a0f7e45ffa3263d7
font_02_sfnt_off00014304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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