Malicious PDF — malware analysis report

Static analysis result for SHA-256 2983eaaefe2e0a91…

MALICIOUS

PDF

86.3 KB Created: 2021-07-20 15:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 338d7aadeeea058b1aa9906b19e1abff SHA-1: 23336ddb60f4aae52418b00cc9b2ee39d64fe031 SHA-256: 2983eaaefe2e0a91114aaffc4c514b74c87ab2bb2a5d0c16a527c6b3afcb89ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaea1b81f18---zewumobu.pdf In PDF document text
    • http://shqinze.net/admin/upimg/file///74549493842.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c4b86350a---sugeliduwebesomujabofe.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/79624495377.pdfIn PDF document text
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/84439033079.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/30035910737.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f18714297ad42c8422322013a983a5db/mulujipadukamipugeromuko.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45dcae144---71425489432.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/79202247695.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/af7f3041a5e2aa0b2211368b69649d9c/49602019184.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/37212941650.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160887aebdc47d---jowobijikutuxawolane.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609496efd8c22---52337965825.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a2b17e07e3b25ffaa98b97fec5aad0cc/85889634520.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/e7d1b819df5df79eea69afbf00233968/48225326762.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/pulafigemuwe.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b4f66df4e---94615277453.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/2292300160.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/43e295a18a16ba563b93137a0a8bcf18/11734669952.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7c898eea2eb5e1c27e3dbf364b631a56/23474669480.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160904d302b036---rujikutejulololibemarifow.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c30bf0e8a---6691778250.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/rv8ou9o0defa571607qph502lb/xedib.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f8a2129b1---maxoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=project+report+on+insurance+pdf+downloadPDF 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_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 17224 bytes
SHA-256: 6193a1dc81e873406f6b059f7c93bbc765c25993e22ac350f7b963f7b9960c71
font_01_sfnt_off00011a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 10928 bytes
SHA-256: 7b8aeaf76c5d5bae1f0ffe142884868d184d25e3a3cc2c3df56c0e055dec0f3b
font_02_sfnt_off000133c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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