Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83866710316b6b3…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 05:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19d9380c8df06fa34c1b5d36d9d2f93c SHA-1: eca03eb48120e7b50dfd4aab23bd27f075fd6dc8 SHA-256: a83866710316b6b3b8e504a9c3cf0993a1f4fd60d73616792b44e691f5a06c34
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content, leveraging techniques like spearphishing attachments to deliver the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=fortnite+tracker+skin+generator PDF link annotation
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f1cab7604---76304816822.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/74531334273.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/12862644740.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/20007156756.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/15585192314.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/fujibami.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/1410884064.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/20800494386.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/newokuvosusej.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/26gtvtp9obqgq88u13ttg7ea8q/fumuzagekit.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/97680879976.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/pefituvusuguzixedepawuf.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/lofaziteliwid.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/52124241578.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409b5f052e8---81876767019.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b943f15c2---35271415576.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/jagufamego.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/75545272518.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/kosojivopewefisarodogeji.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613776eb70671---31320102299.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/romopokopesam.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131c9307d7ee---94996733594.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/89655678897.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/gexulusagafixekinutavur.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_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 10428 bytes
SHA-256: 8ff499cf205b3be560a3b59a1990d4ef7bd4ecdb47dc13316be4603601f2d7c6
font_01_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 16640 bytes
SHA-256: c9fa148bfde564f9c4ff37696533c5a60144b3c18e58396cd298ce9673aa1dda

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