Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f53eeb7097904eb…

MALICIOUS

PDF

86.7 KB Created: 2021-09-15 09:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d2677c6bb5a88fbb9dfd18af855e970 SHA-1: a343dfc033e60f927b41aa1a297a684e9b603647 SHA-256: 4f53eeb7097904eb245590eec25e459e7b9de2ca515cf6d116d4d5a3632ed8cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

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://drafthe.ru/uplcv?utm_term=how+to+take+backup+of+sms+in+android+phone PDF link annotation
    • https://securitydm.com/slicice/file/70704480415.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f1e054866fa896ec9ba721416f8ed306/vosixenilexudorojokiku.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/namogibewikuwonapo.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/gelogimu.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109071454373958.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391b68c59e2---89286990078.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/vinib.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614146a3eb66a---43743053204.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210906_2616E8F20A44A134.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a6c8d52ccc396ce14d6ca409ec0e2b1d/selodidugokonakakoda.pdfIn PDF document text
    • https://t2sc.me/userfiles/28121915285.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613383b35b4b9---razabanivemetojanamoba.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/39631737127.pdfIn PDF document text
    • https://nomortiga.com/contents/files/63833418250.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/30547448466.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/k3ohie40cg4nmdtib8scs0ik99/jefebozozus.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/76131168278.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/soluguriwixebasonopo.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/23273647936.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/84944317533.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/54363741147.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/31208996333.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/natowuruxi.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/96953413337.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/05il9mjcj2mnp4essp56tq9cc4/8895643625.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_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 17620 bytes
SHA-256: 0d9e55f76376115c84375deb6896c13c8e9b0afb20c046441b91872e9050534c
font_01_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13289 11248 bytes
SHA-256: 7dad3849d87ea54052ab6a19f24b46a3fb42fff1e76ea8690ba78e968fcd1277