Malicious PDF — malware analysis report

Static analysis result for SHA-256 893cca715b01833f…

MALICIOUS

PDF

88.1 KB Created: 2021-09-13 11:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2b8cfbe34eec094b6e5ff32aed7cef5 SHA-1: 578a748523c20e2e8459116df9eed498165e5a8a SHA-256: 893cca715b01833fc960b378c44767475d26b64023f76d3565d8f5d750be26b6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content or exploit vulnerabilities. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a link farm on disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d58cd3360---jilajuvenuzo.pdf In PDF document text
    • http://tetrafluoro.com/upload/files/watibisetukajol.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/delilu.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/48514229809.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ff0ed8dc2ffa04a53d2a102a41fd1c90/kejelasufekow.pdfIn PDF document text
    • http://melvin.cz/data/91767948216.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/5437289251.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/33168639942.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/46220687906.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/biwemavojemiti.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16138e5a124bab---jimijorunanamitemafat.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/24542083710.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/maxoxagegemaf.pdfIn PDF document text
    • https://trexanh.net/upload/files/34557129844.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f137e1e6---56204653299.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/mojegepari.pdfIn PDF document text
    • https://matricula.arendic.cl/files/55656021395.pdfIn PDF document text
    • http://skisun.it/userfiles/files/42263893597.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/9820268150.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/82633415137.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/loluwifuwamufax.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/26619929575.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/73918155074.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/11336a030d2f2d70f5663b895d2a5a03/52759716641.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed84722138---zakolagoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+connect+android+phone+to+laptop+screenPDF link annotation
    • https://mediaget.com/userfiles/files/dezatuviwo.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_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 10688 bytes
SHA-256: d40d6c4c22d1599400b7e94d54029357e55b83b9f0ef73b46c9df932e4854c53
font_01_sfnt_off00010c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 17576 bytes
SHA-256: 722814b7d670f9dd8e91f5d2e5fc4b52a1c40c021dae899a17791bc7812f7ca3
font_02_sfnt_off00013a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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