Malicious PDF — malware analysis report

Static analysis result for SHA-256 d986e81af8f18075…

MALICIOUS

PDF

90.9 KB Created: 2021-07-04 12:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 33c8566ac3f319bb37ac0b8f04a33eda SHA-1: d26b0d9def234b1229b146d8faee703bb3f7ff6e SHA-256: d986e81af8f180756bc90815830054bad4cf742b171deff6497debd668a12bb3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The primary attack pattern involves leveraging these links to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://autosaloncenter.com/uploads/file/vazugulowavapodevurosa.pdf In PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/40057184546.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79a4bca20e---78935155905.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05878c0114---zadezi.pdfIn PDF document text
    • http://casaalu.com/luutru/files/9289677263.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/mogeropebajuzubogufevu.pdfIn PDF document text
    • http://salkim.com/userfiles/file/fubabifafivemi.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/84249a3c529d42fe6ae5110ed4ae608f/25722853141.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/29956789012.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/55603818948.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dc4350792---48717040141.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210527005540.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/51750570377.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1c3c34e4295addb23cc2ee8786cb31e4/fubujeritaxusen.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b2db27bcb27240e14e0eb9f66413b93c/46424557421.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/difoj.pdfIn PDF document text
    • http://pneusmarene.it/images/file/kowoxugura.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/54c6744304eb7f2e537db3de0d4eae12/kepulisafekalijelira.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c97f16681f4---fekalof.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/fuzikileruxop.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/03a241fb663fdb7f048fb9fe81f5989b/kujipowojowa.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7fd6333c0---nelorowojiret.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/42297930949.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/5012284313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=extremely+loose+stoolPDF 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_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 16844 bytes
SHA-256: cf7bd10bb6b9634a5c5f320dc536cae12328391c50f43b0a879309325653c49d
font_01_sfnt_off00012e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E26 10112 bytes
SHA-256: 6392e5d0e7a2b4c5576b12fdb18a1e1857ca199387bf8ae86b219d710805c0a8
font_02_sfnt_off000144d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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