Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc61304630b69ab6…

MALICIOUS

PDF

88.5 KB Created: 2021-09-14 06:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5361268626d33c0fec8e169e6696956 SHA-1: 3a703840565f0a03fd7d0c003873449d5bbfde29 SHA-256: bc61304630b69ab653cc2d36bbea42a3053ff93a272d3aed1e7ff713864f88e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and is identified as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The primary function appears to be redirecting users through a series of links, likely to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://cheers-gifts.com/userfiles/nurawegofinoloniz.pdf In PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/xepemizenodej.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/73635599401.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/ditapagenuketaxuzog.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321ec9e3d86---rinev.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/wojavoki.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/murodabinapamunok.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/1141997582.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/03f0da0a344cf67af436a1775fc11e53/fuzuxitavegurutebodutetex.pdfIn PDF document text
    • http://hadt.vn/upload/files/28889005585.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/5338481400.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d27f8326b84eafc83f395626fa41dac2/37819210017.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/11515496534.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5f61t31r73hffcaui6s7im3f2t/10448091588.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210908_50FCF4EB36DCFFD0.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/zobigemulerevav.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/watuvegoteli.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/4661232314.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/32898780714.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/33816313555.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/35681707662.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/xazubowinuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=where+can+i+watch+dutch+movies+onlinePDF 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_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 17556 bytes
SHA-256: 9d07ff4d184f4733ced762d2cf71bbb07e88d8f5e66c2c69fd0f3085b00c0055
font_02_sfnt_off00013af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF7 10880 bytes
SHA-256: 7cf469a035c1e39b4f72ca0b4ae0141275fdac692ac0e7f7b811d46ae6c281d8

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