Malicious PDF — malware analysis report

Static analysis result for SHA-256 8239e8463300880c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-24 09:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da72daa90fa379e31126663e58fce21f SHA-1: 13522498f68ca8da0c91c671a04ac28de48c0f64 SHA-256: 8239e8463300880c34ec4baec6872094ef652ee683a33c9b1628aa60694940ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=pik+tv+on+firestick PDF link annotation
    • http://albarossa.jp/js/upload/files/kigavak.pdfIn PDF document text
    • https://norservis.cz/files/files/52953538988.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/waxositefotupalovugemagak.pdfIn PDF document text
    • https://svezadjecu.me/userfiles/file/91524660007.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/kirowaxovividifuxu.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/87401001160.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/30554169579.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/7318921319.pdfIn PDF document text
    • https://renault-service.com/userfiles/35976585731.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/pilek.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/luxowibajig.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/91cee6e8e18adc78578354425482b544/8533420353.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/jozagubevomugefa.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/zexuselavitadefaket.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/f3912440029b0d02df4e2e3b429150a4/xepefutenorugejirojo.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210904182543.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/tamoluridapotixijuder.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/7vu86m7t2tj34djd1r23g0hjs6/dufowemikeg.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429829227eb---jukovewitajad.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/madusixeluwu.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/fowulida.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/42561981106.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138e400a27a1---89693548930.pdfIn PDF document text
    • http://dalaichau.com/files/vojozenonesala.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_off0000b7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A5 10280 bytes
SHA-256: c80b24ef66b42253659b4477944c4807ee82a69328211d5ccb2cfac08d7be11a
font_01_sfnt_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 17880 bytes
SHA-256: 6e238a5f9f4c22bb51471b5844bc53b15673c856ca329129c253dbe8750e8a7c
font_02_sfnt_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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