Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b6cd2e259240c3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 01:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afb79f5e3b61a5a273c9302c3ae63c80 SHA-1: a0eca44e9623430f4b914e6b3e1ce4c4202bdea6 SHA-256: d5b6cd2e259240c363262d0a20d626d95ede35b80b0d355df753dd67d78e6af5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites and utilize link farm techniques. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially malicious content suggests a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://aduanaldelvalle.com/userfiles/file/gopetijoben.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c60bc50be92---16816918218.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/gisilevamobusetunoxaf.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/matoxemabuvinunarogosa.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2725675e0---sojukipokoxokamuxaza.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/c82e16b6826064de991be1a9df0dc564/gopexilesiwazuk.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608924866ce98---fifowevididegudav.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16104362190f6a---95235431987.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c68c4dec154c4e9c5258237e1d79063b/kexabesedezov.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/4bc4dsr0nl2bc9424150ehektb/64065139296.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3e6a98732---vafekuba.pdfIn PDF document text
    • http://allycatering.com/userfiles/gebokasakep.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceeccab535---xikutin.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ciom2717qlotgpfpse40f1k0t9/95624304764.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/16359332030.pdfIn PDF document text
    • http://cwesp.biz/upload/file/womuxoxuloxi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/mofuramekalerewumarozifo.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ecpck4pmoc41cth7lct6o0mc2f/sujiruleved.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210717_050056.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a2db0059---63049289669.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/3723713014.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/kawesuju.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/24729269279.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/tomutulagazugivigex.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/63c6f00c1512c93793cb9797c5a4b279/nimopi.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/webobasukogil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=personal+pronoun+worksheets+pdfPDF link annotation
    • 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_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 17636 bytes
SHA-256: b9af44d395bc4dd07e2192a627b4b0d41b54cf18fd9227b243e809b3a4c46441
font_02_sfnt_off00012356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 10784 bytes
SHA-256: 57bb721121bbb470f069b3db99e85aa134be76666ac8701441094b2a473df767

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