Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3775b549d52f327…

MALICIOUS

PDF

86.0 KB Created: 2021-08-24 19:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fdeec69421f0eb71631a83610013f0b6 SHA-1: c79a908581decd563b3e2745aaf2a86ce029ca08 SHA-256: a3775b549d52f327b06e856d5b0616de54ef317252435e80f6f5a6c1513e1a58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bac0ce292---70003402206.pdf In PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/zaxigagusonusixu.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/59731181262.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/64022971495.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/sonaporabozoderotegule.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/1qq1vcg1m86fk0l9sfjjkhka39/wifajutelalixijokul.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/fakewodofiwopivapopanakaj.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/zoxozotugiwowozi.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af7aebe1cd---gigimulutefipogukil.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/9459611350.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb0607b11---17003198382.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b97325ebf80c60e7b666445a3333d4f8/98023862464.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/leloniwarexopodefulakake.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/76711702517.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/67434836940.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/66876197155.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/vafosu.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/vopogovam.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/fijigonuwozoramo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b510e65d9e2---bujizezuxixarav.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/merubisa.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf30b21cae---pugij.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210709223133.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1494f94613---42296819012.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611af49f505c0---41165225562.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6ef6000488f6100c7c2953f92477bfbf/zumelanulem.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4e892c832869cf0f68e631b6449b1aff/16119448245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=chocolate+chip+cookie+dipPDF 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_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 18216 bytes
SHA-256: 0a26369044fd70a3351c62f7bf808dd8c6b8b7326a6812012af3b39d27763f55
font_01_sfnt_off00011a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13223 10364 bytes
SHA-256: 4894245bd253cb738a6bf922eb10e38193e4e02833fec9d6e7b6d509d5a76f60

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