Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb62ea5fc64c030…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 00:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dbea8864e33e07457d86c0b39dbee85e SHA-1: accf7402e70fc5419fbcedd706290af0b53b45c9 SHA-256: 3fb62ea5fc64c0300d095ec21f3fb9ce56ba2d51606a622bc9b0d5809571443c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to download and execute a second-stage payload, while the link farm aims to distribute the initial lure across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://bellina.pl/userfiles/file/25446116562.pdf In PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/muxovefimorolutad.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/zowekozexetamop.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/97682145559.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/94634260463.pdfIn PDF document text
    • http://lulanjina.net/upload/files/dubaludojozisov.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/45579991495.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5623ac5c7995a7d014e95451f4655b64/67874987941.pdfIn PDF document text
    • http://haki.vn/uploads/files/jokudu.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/padowikuzuwe.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/wazomogigusupadudik.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d6d15467---88281296861.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/repamexopuvi.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/h9umnempaktei8oj1oun0tm7de/73147586990.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/58057632318.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/wakoso.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9e05dbef---87365561731.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/57932837589.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/gawobixap.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133ceda19533---pedetiv.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/fumodesejitumosese.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/vetagozizake.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613131f488840---1221155879.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/tobeju.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/votop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=picsart+mod+appPDF 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_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 10392 bytes
SHA-256: 4616dbfe06f9296ff279b97708a1fb127ed5abf6bfb9c399f90f8e5652bf1d5f
font_01_sfnt_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 18056 bytes
SHA-256: 1ae974b02ed2e2b0c39e80e7514c338b91d75591350a30aee84315219910d928
font_02_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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