Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3e33a7f856fa51…

MALICIOUS

PDF

116.7 KB Created: 2021-06-25 18:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 116310070d8c51a28d9c86109dea2945 SHA-1: 83ee09eb3e41f5ab98e6ee906a750e6e18cfa260 SHA-256: cf3e33a7f856fa51f169f172575e43bdc911140bece81a6897292047203e9d1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions. Additionally, numerous external URLs were extracted, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://crewmak.ru/uplcv?utm_term=federalist+opinion+on+the+constitution PDF link annotation
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/7sdagt4ct9hivdap5cadubn238/19230233532.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/fusasejufaxijide.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/vepolexunafoniroxokap.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/kulig.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3385f95d---70690715125.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aba39ea0e---864913160.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21050216043019456177k0cn.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e66a16b97b---25901416854.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/gasusezumenuxisukerabolaw.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb6b1b0b20---5885865369.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/zujoziki.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/0755a91c36bbed5eaed445dd4f1c846c/35570919312.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c50517df1---metisijix.pdfIn PDF document text
    • https://ka-base.no/images_content/file/jusozokuparumitamalir.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/29383723112.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/fd114bd976e57da4039b06704e19bfcf/mowosorawijifo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c06e76156---godozadaxumivijotip.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a15fb4b4a92---buzurimetoxoditovolex.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf2cdc459---49311709376.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cc8cb78bf---7878271558.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a42dea67d90---34496196820.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/134a3173a388032084d5f2412032758b/23274601935.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_off000165f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E02 18116 bytes
SHA-256: 31b7e74f5d7f8be21db267852b849cb559a1f8f6f7dc66da6182a3cbf53631bc
font_02_sfnt_off0001ad23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD23 10688 bytes
SHA-256: 083dda583af4108e114b3580fb71f0b7f94f4a2399eca73d9b1eb9b5f4bb92f1

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