Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e2eaee08556354…

MALICIOUS

PDF

73.8 KB Created: 2021-09-06 17:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85d039bb43bb1436f4f7cf7fcc350ae9 SHA-1: 69cab8bb015760fdbf94f43a72c9fb75d3e377d5 SHA-256: 98e2eaee08556354cdb5f88ed7845e31b85dedc0d67514b325dd0b82eb357719
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure itself is indicative of a link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=codigo+civil+pdf+2019+comentado PDF link annotation
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611776bea1b1b---62315783042.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bae0e062003---7002938141.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d99680b329d44934876871b2b37254f/61147472362.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/lopakojowiw.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3f07c642a56ba3e1777d412874254892/pejiwupazera.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6ad8e9e78409e3ff3f776f9381247245/56816372633.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/viwaratumavanuzipomaxur.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079e4d1b4e83---24851854370.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/8b51257cab951a289a9651cd2662c35b/dusabomajaxekolirapugikeb.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/ff813745a8f5c8844cac4656a5da694f/mawotuj.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/wefabijabo.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/wosugezomolipijubunimuvi.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/eac6f61456c3f25782327812f25eaf45/fuxasimokanukodubotaku.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/73qfe9uk4ptd0h5s82svakr8d3/kafobiw.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a55e7dde54be0c9d9ac024b2d8ce50b6/52443609794.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecedb44faf---movosesugolutobab.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/66867046099.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab339077add---77462870145.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/zuviw.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/44146901983.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/bufubavefukiv.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160e00eafc16fe---78289448910.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/mutakafiwi.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/65890214527.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_off0000bbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC7 11252 bytes
SHA-256: fceee70e53f0f1673c6aa478515cc789b59e96951c16cc288089c037790ceb2b
font_01_sfnt_off0000d60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 17072 bytes
SHA-256: f26e76deeb48756960d561ccceb5532081fe33978248418d0690b98596ee9547

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