Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb11eb93dd4c896d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 03:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 67ea731d40673f92d486b08be21afb2d SHA-1: b082e13aeff0285cf901bf8b93af7660fe650454 SHA-256: fb11eb93dd4c896d49cc98f77f07696ea0a437078f313de8b9ae94a2ff95cd21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=a+teacher+2013+full+movie+online PDF link annotation
    • http://ackerviewguesthouse.com/userfiles/file/lovoderubaleze.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/74c4865e1166a5c7cf8f5dbc8632b3ab/zolenilaxoxinugawupu.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/18243185402.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426fcb92885---bixikeketudanikedapunita.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/kadewamogan.pdfIn PDF document text
    • https://kawanmto.net/contents/files/ziguse.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/40829051667.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///40724500331.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/xubofedaligegatata.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/jofus.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/77355732855.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/82124747774.pdfIn PDF document text
    • http://bankerz.in/qpic/files/69216839447.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/sulobavexenibowe.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/pivifolodejapu.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/doganojazid.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146146bdf61d---97387956387.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/waxufeveba.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/sofefovebabiledaj.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/mimawis.pdfIn PDF document text
    • https://termoformat.md/img/files/gimigevetovax.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/96934468879.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210912041616.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_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 11044 bytes
SHA-256: dd00dc562146868b5c9b5bbb304f49e362198d9e2a95d96f3317b6c4f5b8155d
font_01_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 19528 bytes
SHA-256: 9eb5f16f09d8e1b54bb0f614d76b576d30a6057447ae05fddb7af130b3ac5611