Malicious PDF — malware analysis report

Static analysis result for SHA-256 69fddf33ca87f631…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 11:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e7d3e3c6d88a16fea65088e0b781bd1 SHA-1: f9de93d420bba7b59cb511ec720210e93d7e7a2e SHA-256: 69fddf33ca87f631c8ecefbd3eef4230edcd1fba3975094016e200e7fde276d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are often used to host further malicious content or phishing forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crysiq.ru/uplcv?utm_term=rational+rose+suite+in+ooad+pdf PDF link annotation
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/fa19c4e79be5ab0c65e1d390fc5f6b8a/26329813109.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160dad9428276d---26544097684.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/gosogi.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ec961362e---jobeputokuxidife.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fc3536fef---1036677778.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/87628339506.pdfIn PDF document text
    • http://chatsystem.site/js/ckfinder/userfiles/files/66730663392.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f902312946---vafavikalonujakedoso.pdfIn PDF document text
    • http://elitvorota.ru/f/file/bonarobinedibamo.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/78589576610.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/da0b0b1412e6b6ab8717b242165f3495/lazowuv.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/lipabuzuzelupilifaxij.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf95c9c83---98451976689.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/xozokatofizawuxoxenipez.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072ff1e491d3---tolipamenaregovalowab.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/14217688546.pdfIn PDF document text
    • https://guijek.com/userfiles/file/vugizipavubadibuvez.pdfIn PDF document text
    • http://vkts.se/userfiles/file/683747794.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b2f6a48ae9e05d6cd96402840fcfc399/29699214606.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/lamureda.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/91756077147.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a0742646dd7---10284477266.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_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 10636 bytes
SHA-256: 55c6f155815f102ff0cd4f64845d0645ae1eac8424e8eb8b6c21923e4c78d52b
font_01_sfnt_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 18776 bytes
SHA-256: 25b1f52166cea8b9534763a584876cfe1ff40823433901045949c3e8ada58a22

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