Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5883d62a3a28df7…

MALICIOUS

PDF

71.9 KB Created: 2021-09-02 10:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9c8b389610f4873a063595a5371fcd90 SHA-1: b1c931adec63a25c48dee15d36aacfc26a0afd0b SHA-256: f5883d62a3a28df7d19635b6929da45e1c53be35b4f16dfbadb980cbe6d12c12
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://crewmak.ru/uplcv?utm_term=illinois+corporate+income+tax+rate PDF link annotation
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916f11a0a13---11064781978.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e535e4bc54---95398489148.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608475a710054---bimowogaxigozaranovigele.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/58721235500.pdfIn PDF document text
    • https://micsys.in/userfiles/file/91439263546.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/kirukozejilebidejijamis.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021072720193773499.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/94925575165.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/26257566760.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af890550fb5---nikogiwogefuwurevijapezu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ab88ad698---78128596948.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f531f6bc1a---mujonisawonipivuremi.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fae38c28a67---22908566631.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073075472169---51372918028.pdfIn PDF document text
    • https://bor-diing.com/upload/files/89342794514.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/jevipoxadatujeb.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/10121138117.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/velovizubaviziwuwafazi.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba934ceb213---bifim.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/xitazaxulekozinuwefo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c3bd4d8064c706714e277203bbc3786f/44484797421.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbafc8a353---xajinugexaranagesaluzopa.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977de0be114---96170753858.pdfIn PDF document text
    • http://chayka-svg.ru/files/17911240510.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_off0000bc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD440 10588 bytes
SHA-256: 6654272d4cab55a8a40733131cc2237a00ef871d3a21673b8d5c98aeaa910422
font_02_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 14724 bytes
SHA-256: 4d1fd9efa607c484f6a53a80a7cc0b980bc779ecf34c9e08658b1602c1a2ac94

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