Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b85baed22bb593f…

MALICIOUS

PDF

107.1 KB Created: 2021-09-10 13:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df717c8fd358e0d300fad1c863ac1403 SHA-1: 21f4da80b154966b5892605298a993779174ac70 SHA-256: 6b85baed22bb593f8b60d8fec8db0eb250fac3efc9df6efbf3587a482e978b5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=sun+tv+serial+new+timing+list PDF link annotation
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613072df115b6---pelezezelozujoluxulugupo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161339f211fd11---43117359139.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/sirisuvonedafuw.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xujizirizalemutib.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/23497976907.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/ledaruxegomolifijuxubeba.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/galofakenomuxos.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/pakelamupasirivivino.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/widegafuxas.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/868dfb99b47524c6efcdc724d0aaeaa3/natisovetomamukegepu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/52842c32aedce935095bf7f8ebbbe09f/xamuwepuzuga.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/71843994201.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/92365050285.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/29566125450.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/titegize.pdfIn PDF document text
    • https://sainaudit.mn/File/22774353504.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/mopomuzufoxolixexo.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/safokogugisajavufibezan.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/sotujimim.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/vapinifutulawo.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/36541268865.pdfIn PDF document text
    • http://poorclarescork.ie/images/bovelirenuruzojevepusi.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_off00013d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4B 18860 bytes
SHA-256: 2f7561d5cf60e7bd1d9ee19327980ec98cf710fac044126a2afeaa17439825f1
font_01_sfnt_off00016e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E2F 10660 bytes
SHA-256: 8242b07d5304f3bb057db4bbaa1d4d5953a23073c65c72bad3723378d92db345
font_02_sfnt_off000186a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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