Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fd9be3bf2c0882…

MALICIOUS

PDF

69.4 KB Created: 2021-09-21 12:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 327e887afa3e80d64ba6aca2c5ba2edd SHA-1: 224c5f319c67598ec7ce120d888e50dddf5c93c6 SHA-256: d1fd9be3bf2c0882346d1c2b9c324dfda23929bafcdc6e19e67a8224857ef317
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 WordPress sites 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 distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=ps+touch+apk+mod PDF link annotation
    • http://inbeeldt.nl/userfiles/file/mumofesom.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109122145538376.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/fipovivelurudiwibeloxor.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/dovuramigemanefajasobe.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/86202534286.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/kofukawuwozoro.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136628873794---74497370745.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090916041964.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/11610617687.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/79375513736.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/nibegisotilubodolamabuse.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/megozunowamunizax.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/42870977634.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210903104557.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161402b2e5ff08---99961865598.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/40718078976.pdfIn PDF document text
    • http://huarong-bio.com/upload/files/maximidapojijojakumebofow.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/daxojejirikijukutitegogap.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/80766121389.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/butomeperikejunapuvototeg.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210916_26BBC2F733C2365B.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130fa1c262cf---dajelukusub.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b133347760---jopawasipowefawezekeku.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_off0000b310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB310 14860 bytes
SHA-256: 639bc9bbb3ef40ea66d9e5c9acff23a6a112fb143dd46fe8dfe24ff5f3e10b59
font_01_sfnt_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 10500 bytes
SHA-256: fb93096c775db5db7a7dec6b5955a9479b579274ca319615df0ab97d04932ce2
font_02_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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