Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79787e8a1944254…

MALICIOUS

PDF

81.7 KB Created: 2021-08-31 07:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bcd9df456901b626c3562f4c4588884a SHA-1: f5704f078401fda0c1bb1f125195efc3c88e2aab SHA-256: a79787e8a1944254629cab85bd2766cbf7f7604a24a4d68e33aa59aaeb721312
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pistant.ru/uplcv?utm_term=individual+learning+plan+examples+autism PDF link annotation
    • https://candica.pl/ckfinder/userfiles/files/29024342077.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c5711e0ef2a---tofutevafolixexorabuw.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/jawuwifomedupuluvusoti.pdfIn PDF document text
    • https://csn-alliance.com/data/files/85203815305.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/h7hvhpmj81skn0a40qjkc67p7j/37120060556.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b8ef55527edadf1a01b06bc6ecd5520a/vapunijezotavinurukuwe.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c811d156ba---wekavofulekeponajebu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa901d47678---domebafogobedaremugi.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9bf4a56178b0f68fbf272db8bae29050/6341262904.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210724024323_sebnoa.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774046840d---kuvivoxa.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/5302323619c357c66f83f50c636419fc/80160552845.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/podegozo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6c30c9f85124d6707e4e10ea74b2839c/2008254434.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/28205026466.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/jebalumaxiponovujukugod.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/hbnte8k8i48sjfucr34dvi9fvv/luxaminafefuliwadaxa.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/vazegokoxewijip.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/70573216939.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b9e10124693ccd0c7206a8b463035a7c/85383027787.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/dulakabas.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/kudedorazamasadipufimivag.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/33176362933.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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 17252 bytes
SHA-256: 69eb8f0ace0fd6d43c3ed347c5c72ef04a86cff2b81adea37202b7fa7f75a543
font_01_sfnt_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 10836 bytes
SHA-256: bf5de08a04f49d1761c0698fad3fac334d1a56ca5220fde6515724bf178a0c23
font_02_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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