Malicious PDF — malware analysis report

Static analysis result for SHA-256 488774b3d4415429…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 07:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12af5b1ae22d7dec1ff1c956f935f5fa SHA-1: b86468e7faf7f0dc5916b8363b52c415f5c9f559 SHA-256: 488774b3d4415429479bec77038e3ec1cbfb9c7ac44a9bf11f300bbb99babad4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://allytemp.ru/uplcv?utm_term=emotes+gratis+free+fire+apk PDF link annotation
    • http://montagnobozzone.it/userfiles/files/pefakisalewenaxojalu.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/83987460386.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309fd6528aa---regasetexajewisadoni.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/zoxofokexikaga.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/oftv41m6pdfluosp340qnlhm0r/86458654078.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/divuwatazapojonavo.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/jopevopu.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/7003753450.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/62820898751.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/soxemadupakok.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/xejobuxupodemo.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/webujapozesimubetu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a452e8633e---74456259936.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/togamepapol.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/borutozuligewamaderoxiw.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613de1eac59d9---dexememupokokumiwewikulis.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/pegusuvotagoserijuv.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/tukezamuven.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143c1563df6f---lasilawawar.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/560645dbb9ca8649a4cf70023150247b/xisemafupivadogej.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143c6c3cc3b0---45387982855.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/99869339791.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210909_B4E13F45C39C2101.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/80127224286.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/vadilaxozefoxivu.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/sutuvunavazinuleziganoj.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/pogomabadorexo.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/gomaf.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_off0000c1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B1 10624 bytes
SHA-256: 0a7d39da418153990651b579c96c33d10e240b9bf466a64fcc5db9087fa6a5ab
font_01_sfnt_off0000da0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0E 17756 bytes
SHA-256: 14d67d7ffabec4a19a88814d3c1ee1e9d020a52fba1d62a44b33b5742aef21d3
font_02_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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