Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7ba43bc31208ec…

MALICIOUS

PDF

77.5 KB Created: 2021-09-08 08:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4eb61cff9d8539e7488a5966bbe4b80a SHA-1: 78087bcb744a7de4057434b89e07281353185d5c SHA-256: be7ba43bc31208ec446ecb8b62f01d5730cc94060b0c8d0ac163336aaf47735a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further malicious activity such as downloading additional payloads or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://inwebjor.ru/uplcv?utm_term=pocket+dictionary+of+theological+terms+pdf PDF link annotation
    • https://egyediajandekotletek.hu/mvc/userfiles/file/laruwopowufiw.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/84907031139.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2d6b09e26ad35e9e8cb341b40d2a32e0/14494165266.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/38481414526.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/u5ig9ohkf1i3sas2ko9caiupg1/86569758941.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/tawogesu.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/40462580650.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/jovutejijev.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/70287178104.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/92446985578.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/26989640181.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/42286012340.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/74234768662.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/22414387697.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/pubuguwaxapis.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/viwezosatojo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5320068ef8---77686589344.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f637d73d6---magikanazegifibopu.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/zidinope.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/971f2ebe8102f3ef50ff1bfc7498cd73/xulabosinivolapeku.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/varuvenilisuxafad.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/17132194558.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_off0000c5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 11272 bytes
SHA-256: 24bd6bfc1ef0d97a434c839aa38a9ce4ebe6ef16724af056148cdd27895f70ce
font_02_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 18312 bytes
SHA-256: dbdd01e75b6075d7f02c48ab1822dff854ca95d9795499afc351a5a73780238c

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