Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce83f41a593a04c7…

MALICIOUS

PDF

86.7 KB Created: 2021-09-21 10:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e62f68a6137d121619ecf885de9eba44 SHA-1: 31d18a7c82529db95de6c24f9995bc106517c805 SHA-256: ce83f41a593a04c7f99ca823705499d0fe94869128119e99453632aca9b55368
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://epwuae.com/userfiles/file/lukenezarakogira.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5fa2449b9---85672641929.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/mavusewelurukunuvegobe.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/35740388946.pdfIn PDF document text
    • http://risme.vn/files/bulugaxisomukefakovu.pdfIn PDF document text
    • http://186086.com/upload/files/5724640722.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/kezijajofag.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/wazabinimawovofoweligof.pdfIn PDF document text
    • http://cissi.it/userfiles/files/53029921630.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/mebodibapanogozisolubede.pdfIn PDF document text
    • http://rrarental.org/upload/file/65625225851.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/remojuxet.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/dd83538315983d08cb365f6467a8b673/vitufuxagusomarumigolezun.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/wajaga.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/pokujapanabetamuxugutupan.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/zusiluvutofomo.pdfIn PDF document text
    • http://laserinnsbruck.com/static/pivomikower.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/mejilakomumojamevi.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109102335103468.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/supavibupuwevobamemig.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f00069fdcd---17358312869.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/7316532540.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/babesekidutud.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/fuvagebil.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/98777621028.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/xububokazod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+convert+html+to+apk+using+android+studioPDF 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_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 11296 bytes
SHA-256: f26d271d9c44b039e3fe32f1be159f529a7d3c17cf4d924a386e46dfc0cfa727
font_01_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 17312 bytes
SHA-256: 2ade3b4df8ac4b74c479c5529c64be8256a19beab0b07dd0215f46b3c8382084

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