Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddee490d5ea8348…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 14:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45ed7b14c5eb50ec25ca31fa55c58113 SHA-1: e37fc0d851fdba1aa8da16d224d54df7e253cc3d SHA-256: dddee490d5ea834853e346c394a5536c7750ccd72dfd34c64006991ddd6223a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=nck+box+crack+download PDF link annotation
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/budofalavixurinixolas.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/nikowotepudozezabureb.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/54965752334.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/51026492546.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/zilaz.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/17661409828.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/898e9063b7b6fc7873693c800a49da46/zemowazobojag.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/129006812.pdfIn PDF document text
    • https://svltv.in/userfiles/files/nuborazizusoli.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/69767472910.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6f76555e8---23859112837.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/firor.pdfIn PDF document text
    • http://weingut-suppan.at/files/felovuzusivivojebodalali.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8b566aa1---derexasuwagijatagiguwupoj.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/71677639045.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/wutufo.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/zegalawobalevok.pdfIn PDF document text
    • https://hse.tw/upload/file/fabel.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614013514b809---57377107461.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/gejumagap.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/nexuwerepubotusurarupuv.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/50835831124.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/65195335000.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_off0000b2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A2 17052 bytes
SHA-256: 7d56db65c71b039faf540bfbf0d3deb084256e2ddd7105a722aa7ff4e063dd21
font_01_sfnt_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 10272 bytes
SHA-256: b32b3be62913b0d91dcc12d9ec2eaa349e086acd7446195e997f77b3ee3f36e6
font_02_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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