Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c281a3c7931c53b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 09:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29a099ea2923ec50e0b12d4a26a33039 SHA-1: 7b1940de2d62c694f94a253466371d05c78d49a5 SHA-256: 2c281a3c7931c53be296c478bb296e707c6a867f1b66d85a709c62924261488b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host malicious content or redirect users. While no scripts were directly extracted, the PDF structure and link farm heuristic indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5fd334e6b---2630105034.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/05da27eab905d8c3d6db9cab9e716013/56941967995.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/vukuxiwajekarogavogurulop.pdfIn PDF document text
    • http://abpaluso.com/upload/file/biforomavuworowugitotekoj.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/risedina.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///26688805150.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/92907362992.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/90009419302.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/bikidofetudotewe.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab85cd8e128---16913859933.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/bofapa.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b03f9fe28---retojuvubiziloko.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nunutejiberifafa.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceecbe8ea8a---46043068329.pdfIn PDF document text
    • http://alkanboya.com/files/file///87275977739.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210720_020309.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e56c215c8e0---35188437053.pdfIn PDF document text
    • https://luminex.pl/upload/file/rijipizukadijemebob.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6dd13f9898409d64444d5f290caa5210/zuzami.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5be5e25c5---87990160565.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/69063691774.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/71635862361234ab385e21.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/fafozidebixijuvanif.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/xazizonelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ambystoma+dumerilii+pdfPDF 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_off0000e809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE809 10892 bytes
SHA-256: 3bfe91ced328581d9ecc157090aec3fffeb1d5748252f45cd21e6d3842bd6eda
font_01_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 18688 bytes
SHA-256: 2ef81ba5dd4a072274b24a363b6a8f0623d522cbf3f9571072c9e32d6d5430de
font_02_sfnt_off000131ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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