Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40aaa51fd93d266…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 12:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43e66e4febe869d0a6e7009ceeaf4a55 SHA-1: 9032a0b0a873113662b255eae04bb1755a7c5b41 SHA-256: b40aaa51fd93d2660ad77cebe8861b750517a56118ec39a61b5cd5c3749d4dde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=xiaomi+mi+10t+vs+note+10+lite PDF link annotation
    • http://fqcycpa.com/jingkelun/userfiles/files/20210918165836.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/8853675551.pdfIn PDF document text
    • https://rm-parketi.si/uploads/53625537623.pdfIn PDF document text
    • http://jiducn.com/userfiles/aa/file///vumubovim.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/65183568124.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/6038723352.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/dupisebivisekaj.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210918083221608682.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/34217720154.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/nogekimezaxewamiralufetu.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/77078015815.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd78248ae---6774695203.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/90008135539.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/45536090064.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615000b106af2---didadufipokijenazukowixi.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/jevanoxexefewonaximu.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/gogejosuxuwab.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc87c69fe2---51661322432.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff2c816ae---2473799545.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/jiwex.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210923_023600.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/52020173850.pdfIn PDF document text
    • https://oriolefashion.com/ckfinder/userfiles/files/ranus.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_off0000b027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB027 17064 bytes
SHA-256: 77a6670d44c59dd9493c56daddb78cb8d92521c49ffc143a0c1b2b924a92c0dc
font_01_sfnt_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 10416 bytes
SHA-256: 1c87167b72fd7d3731513cf0b6d7b551b4c0416fcdef67a87c8c002a8030c846

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