Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d55852c1cc20a6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 00:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db5ce1e0705455b699c3469a4a34ba82 SHA-1: 496fec73e256374a2b932cf1933d79d92e212d77 SHA-256: d5d55852c1cc20a6de9ae7b0665c9012d383fdea989140c71b40270dcc6530e1
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 disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://lorofilmes.com/Uploads/ckfinder/userfiles/files/63653187875.pdf In PDF document text
    • https://kingdomofgodmn.org/userfiles/files/kixisodanodaj.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/lelogefugemav.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/66545898073.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2180ed354---96761786297.pdfIn PDF document text
    • http://wamer.org/userfiles/file/rebadedemaxatusebiruvave.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367323497d1---pevujimusujigawapuga.pdfIn PDF document text
    • http://hkacca.com/userfiles/vabifu.pdfIn PDF document text
    • http://anninh247.info/upload/files/41890698724.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7244ccc5684ef8865c6523bf9b1f75a1/vosofegarawetojonimepup.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/75976735419.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/tixagavotulawilagusodu.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/58388795126.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/53559842433.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/xebomaravepeluroxitofu.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/mowufugadiwesupelok.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/27146355791.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614263dda072f---71281807167.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/beguvipaliraxakuzomuwisop.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/lirupunigaferujeba.pdfIn PDF document text
    • http://fgosvo.ru/files/files/jivudewawigenog.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/55748065886.pdfIn PDF document text
    • http://lachina.cn/upload/file/xexijulagerij.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/dafodetagabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=live+videos+for+lock+screenPDF 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_off0000dae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 18976 bytes
SHA-256: 82df9e87968e12775c3529752e2761339208ec4cf64176fdcbcab9a6eaada494
font_01_sfnt_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12463 10324 bytes
SHA-256: 165b62854e52786d045ef939fbd7ace67870018c29540fdc1f237b5f150bbf0a

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