Malicious PDF — malware analysis report

Static analysis result for SHA-256 219893e561d1339a…

MALICIOUS

PDF

93.9 KB Created: 2021-08-10 00:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 303625a30045899897d680c849eee7f8 SHA-1: 4c689db4d47b98831770904a1415955264643060 SHA-256: 219893e561d1339a2640565db385a67de395d7d3766ad26c16d74c435b94bd1d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=fundamentals+of+fluid+mechanics+8th+edition+solution+manual+pdf+free PDF link annotation
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e48a1e3551ca8b0ea6f5fceff81c0048/popivazutij.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/89651445033.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/10835172215.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/70225502123.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/gafewimi.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/35165160209.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/20252119293.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/nifewinunurifagitadiwox.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/faxogozo.pdfIn PDF document text
    • http://huiking.cn/uploads/file/230553186812.pdfIn PDF document text
    • https://digireg.org/upload/98319212090.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b98192f154861fd86a7f3b5d64e4a83d/zejoxos.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/62fd2695e14f7ddaf6e91447a56f2e7d/dokasuzugumeposodika.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/tujep.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c22982a6d2c0ff42c3fc5a57d5559dac/vasulabisozebesuwosor.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-2/20210802172404902285.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/vibowesalaroroba.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/pitaduvesi.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66b8d9db23---69958683784.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/mekejekewosowevapefegigo.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/9faht71noadlgb84qvd0j6t9ek/41160029366.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b52c1898544f2a6e53c095de01e24d06/81420957368.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/b9452d7c2a4d93ae73f7e0f181a0d932/94338875687.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_off0000f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 17636 bytes
SHA-256: 2b803eba62a73d67b365db7e811a686e17fc8a8342bf29dd57b17253e5056d95
font_01_sfnt_off00011ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FE 11172 bytes
SHA-256: e599dc020596a368d2723a17b1d53ef4fc828c187af2e411765c1a0b8b3608b8
font_03_sfnt_off000150de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DE 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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