Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c316fbb6ca2c544…

MALICIOUS

PDF

73.7 KB Created: 2021-09-26 02:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b667ee0af7c1c81ecaba809b3c6086f8 SHA-1: 15e8e359d670345fbb13134cc294deca3f842c92 SHA-256: 7c316fbb6ca2c544b823e27b4a7535c844cc15dbc051153f56a23e5078f944f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=ielts+writing+task+2+ebook PDF link annotation
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161401d355d6ce---xotabamofovinovakoduj.pdfIn PDF document text
    • http://hairandoil.com/uploads/9036425017.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325ba0ee3ad---85502217842.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m05l45dm7mogj15cielk9gdn48/85142332422.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/rekidifiz.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/zatolubaxupoxukuxugadu.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/gulosulapepepuzozu.pdfIn PDF document text
    • https://swiz.eu/files/editor/xugolowatutimob.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/lubagafuwugulu.pdfIn PDF document text
    • https://mysilofr.mysilo.com/upload/ckfinder/files/meromulemuxamuwusa.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/36764790059.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/dedobagasobipunomi.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/h81ag9nicqjonu7aj4ffe2q1o1/62221761623.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161439386a958d---betafomolasokogepojep.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/vudetovasopukaxebemik.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/pafejexeropedirezini.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/subefijedozisebeve.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210923234510_587428724.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/tilawelanutera.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/76330078813.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8ece66f46---solawonawinu.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/43358291031.pdfIn PDF document text
    • http://baoveantam.info/upload/files/daziwojobezuj.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/94956760887.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/wadaxisutamilutekep.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_off0000b98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 10672 bytes
SHA-256: b1a0aa8b4e564abd9718ff286e3bfbab597db736d502dbfa483cb05db6352ca6
font_02_sfnt_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 18436 bytes
SHA-256: 2b78e6fc75fd3da8669d88bf1523fc67607f02a36b52c0ea088da0947033d33b

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