Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07ecf444669dc4b…

MALICIOUS

PDF

83.2 KB Created: 2021-10-11 00:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2fb3263edc64ea0a9e23347ec584fe9f SHA-1: 2e8f001c834f70961a2fd2d482e7815ec783db36 SHA-256: d07ecf444669dc4bd6e99aa4634c8f92fd80aba556c802fb70e59910e1763f2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to lure users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=saturday+night+live+christmas+special+2020 PDF link annotation
    • https://kalashad.com/userfiles/file/poropodaxuvif.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/96716889515.pdfIn PDF document text
    • https://sanidom.pl/img/file/pusetetizini.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/texanafa.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109160358474231.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/61264864947.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/63389062481.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/30822630535.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/wisukulojijubisi.pdfIn PDF document text
    • http://salwex.hu/file/papusunofowakikofu.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/30433653220.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/25692064737.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/dosulerusad.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/70779043063.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1ee82e7e196bbc1aa55636ba40ac18d6/55880763866.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/32487152361.pdfIn PDF document text
    • https://webmenuplus.com/images/file/gikabe.pdfIn PDF document text
    • http://unityproductions.com/upload/files/66510023203.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/nukukexipiperujas.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/25610123767.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1614764c397c5d---15619977330.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/mawireponisubiv.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16162139e50398---gazufefibowo.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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 19736 bytes
SHA-256: 7d963c1720c4f2516979784c1819bce6656a4b5adefa32f86b2d321efe4ab485
font_01_sfnt_off00010ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 11440 bytes
SHA-256: 0585cf9b7cb0ae76d2b842c284ab4fa6cf6ece3534d5e737a754faefb7b588c4
font_02_sfnt_off00012774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1