Malicious PDF — malware analysis report

Static analysis result for SHA-256 4040405b77c47d7f…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 05:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c19223a8c6c7681eab4eff50ee63d7c SHA-1: 3c6c6632bf98f01bd651fdf1c9b078244264e2c6 SHA-256: 4040405b77c47d7f0ddb3cf26aab1c72c299082d872dd5a4a3f947e35bae2a9b
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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://cructi.ru/uplcv?utm_term=mitosis+worksheet+phases+of+the+cell PDF link annotation
    • https://autotrans911.com/thread/admin/uploads/file/gawonepuregoxasemaxe.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/91429111443.pdfIn PDF document text
    • http://zuche0551.com/upload/file/gusudutufigowapozasoliki.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/rf22phg4eddrl41sjsugmtf55t/52749374372.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/gazesamowojukojikaf.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/74382996053.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b30e78df350---36444108222.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/68700762322.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d3ed34f32f---64549387706.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8c3060dad---12918801910.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf89f48974a---92481939476.pdfIn PDF document text
    • http://ibb-online.ru/f/file/sogivivorenikivusozu.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/bofukogavejonalozoduni.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/13837339230.pdfIn PDF document text
    • http://naucseto.cz/storage/jelabatakoligavasifukidu.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/luwefegegovu.pdfIn PDF document text
    • https://oferta.lt/i/File/29634566729.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089d4023b432---70177412856.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4ff946b03c277242fb009be19d5a96e0/zutarigakosep.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/36249735557.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/lidarosivetibowajufiwom.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/24a0c16f8e168a7023082b750382e11f/jejusokipojinem.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/56559150093.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/wotajowobuzuvov.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_off0000cf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9A 17576 bytes
SHA-256: 66b7a864be3abb9816133ebae3557cc7c118458f5955c0060fee9bbb18cbafc2
font_01_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 10644 bytes
SHA-256: 22a9743a412eaf80ab70f7351ebe6d5bd9bbdf9e693dbe37e06e96157f901356
font_02_sfnt_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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