Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a386315d77c414a…

MALICIOUS

PDF

79.4 KB Created: 2021-08-12 03:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 575e83d379a4df6d10067b60f4c679f6 SHA-1: 59d04c67b1d531b35cddd08054fa42897445e0bd SHA-256: 2a386315d77c414a51333c809df07dc8ab852cd4a086aeeb3f9cf21245e5cc4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a link farm pointing to compromised WordPress sites, which in turn host further PDF files or direct users to download an APK. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload. The primary attack vector appears to be spearphishing, with the document acting as a lure to initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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=minecraft+_v1_16_0_55_+xbox+%281%29.apk%2Ffile+gratis PDF link annotation
    • https://bloc-immo.com/images/1389084537.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/jitefugixilajuvavule.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1bd22ab6---jupir.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ef392a9f7024f8aac290f0132e42f57f/litanibisavipuxibafonawo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161071f6d852ae---nuwexavu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8bf144765a5291d0e76014e611ec3b54/botefot.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/gafejir.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ki0kjl9v4fcg9qpkv7nl74l38i/73914771747.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c9319ec2d75---29645112332.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160af69d052bf5---42687344420.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc34551cd9---jawedove.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161001567c849c---34876951198.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d449bd20322b346ad8fcf1845bb99278/42038763167.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/88006052461.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/gabatuvur.pdfIn PDF document text
    • https://wodgluch-projekt.pl/userfiles/84874999600.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c1fbe3554---40713573383.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ed072530956---jiwisaliteverudiber.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/e1f93054d7a12dab397451084b78c3a7/3969623797.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/fisopipodowe.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/22574778852.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/kiwolifuvuloduse.pdfIn PDF document text
    • http://nemochem.cn/upload/files/kedaxoj.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/suburukipasenesibinupobal.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/pejafusajaj.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://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_off0000d17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 11812 bytes
SHA-256: 866d3dd34f8b8862d69af2cef18d1fe2283c633d89a1b9668186fb6ce6ec1e44
font_02_sfnt_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 16356 bytes
SHA-256: 1cfd726152dab3e39013d2c47d403864408bdf20118b75e227a26fb0f66cb8b9

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