Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1786989dfafc68b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 01:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d77633579e2ce8089a7e8236bc50bfe3 SHA-1: 10a3b57b696cbf04b0538123f73d99280116420f SHA-256: a1786989dfafc68bc32c2f675a21a7286a6283f343ad66a9378e2bf9e9a42fcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or compromised CMS uploads, suggesting a redirection scheme. The primary function appears to be directing users to external sites for malicious purposes, likely phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://queure.ru/uplcv?utm_term=pronombres+demostrativos+en+frances+pdf PDF link annotation
    • https://securitydm.eu/slicice/file/97017545666.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74e5d9167---22870115617.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/kituzipotero.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/vafodepujeki.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c8764f4eaba93e2eeeb68f8a00dfeec7/21719185667.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/54106517495.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/68737488827.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/57190725253.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/37684602227.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/7175823879.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/32569228372.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/72c8895c1575ac7244b9f518f7ceee0c/ridupozafiforajotozuli.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf045c8df84---95559527969.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ed1e02ad3c3---tijuvamasigetiwi.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/677654f0b9d0ffa609b0dac139b8e73a/98050396856.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a92c206ed8c---dovuwizewawo.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/renojilidakukesugus.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/43bbe0a67e586d344657f658d2dd2d5e/39667113988.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/13765848002.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9cebf68f736a16f02dc7eedad2ea09f4/92833887854.pdfIn PDF document text
    • http://elitk.ru/_files/54345449468.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021061501432518.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/fasilozabivegez.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/natozodim.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/abkgfue002q0asl2ac0rhr03jg/nuwejeri.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c842b9e68d11bdbe182669001ec6084b/22601547934.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_off0000c5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 10944 bytes
SHA-256: dc8e61b374b174e11d3471603e622d2e39dedfae220f26bbcd3501de07fda164
font_02_sfnt_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 19720 bytes
SHA-256: 968639f0d3784ccb27eb67f160400dbd0dc1228f8ca4b731267742cf1ce70b46

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