Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c6b05a7250b5be…

MALICIOUS

PDF

140.3 KB Created: 2021-06-26 03:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 3bc5e4cfd16430c95ab54c391dffd8e1 SHA-1: e6cff329f989088534060d0415618229a7587f53 SHA-256: e3c6b05a7250b5be15c333ef25b6359a9fec0b1d9ff0a1208a7009082c871a1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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 https://ketchas.ru/uplcv?utm_term=anti+imperialist+meaning PDF link annotation
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b76389c8750---zobenawujewipur.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cc4eb805d---gubatemajemadavinefonal.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/vunona.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/97947551958.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6726e9c89---17030376987.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815d836c093---pepugokikafejebosenuzom.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/mukekikuguvu.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/mugosemoguwisojozaju.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/lelofudiva.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/6c032933fc02cd8a1af19262c5f6eec3/gekadigarebefonepasumil.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160838033591ea---1333896058.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/fekazojivetigax.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/zofuketaligakela.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/71505223204.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608528ce6e08a---nimerozenadudav.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/dupawagali.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf2a5f3f0---mizisogupuxikazije.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d73c9750af---mesipalas.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/rlmpqdkjntiqg204d9g7n8ui36/52878526135.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/divupifepavaputabumi.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/tejuxiper.pdfIn PDF document text
    • https://activepymes.com/pub/file/13050418168.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b6bec402---50749768526.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001305b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305B 10456 bytes
SHA-256: 801eb18857feb5046c2edfdcbce7705639deed9c696baac57525d93eb6d2e8c3
font_01_sfnt_off00014810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14810 17796 bytes
SHA-256: 9813934cef0f973058005c420078574b9350daebf6592a63287dae4b2d2931f7
font_02_sfnt_off000176c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ED2 56608 bytes
SHA-256: c15e32becf5d18c8e81bc9f2c084cbac33294322d576dc92b747deb520969113

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