Malicious PDF — malware analysis report

Static analysis result for SHA-256 b791b0647a5492e5…

MALICIOUS

PDF

87.5 KB Created: 2021-09-03 13:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6076cd941971e0094496de3ce0f0fccb SHA-1: 15c60b677583681bb727cab0055e7ddb23f3f317 SHA-256: b791b0647a5492e5d5d4d316ce7ed7b3d46e0a6540e96ceb4775f515759d0c84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=tendering+process+explained+pdf PDF link annotation
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fc83d049f---44903460469.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/k89mgfe0u12bio3iav1o11490i/13194608251.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/14634571553.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16100d7fb66ed8---81927537184.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160764e18bd269---33555710084.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821de710044---78485354112.pdfIn PDF document text
    • https://plasy.com/uploads/file/19925721941.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/gefafibolivubujakubo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97603d14f---zexawirunufaroli.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8fd545809---mofumava.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/93754995897.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210623_4FD28514DA943B0E.pdfIn PDF document text
    • https://arerp.kr/data/file///titokolopibamelapawaw.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/7930991980.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/77093483424.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/32524245427.pdfIn PDF document text
    • https://senhewood.com/d/files/82648566202.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/4545562172.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/talebibexabodopobozi.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/lagova.pdfIn PDF document text
    • http://minipit.com/data/files/85482388817.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd76379f18---kavag.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f40897d788dc6f9cb579a1892120ad53/27280647231.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_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 10760 bytes
SHA-256: 3d776400118cfe127ac4045c337950afec41811fabbe897009a978d7cf7b2e69
font_01_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 18020 bytes
SHA-256: 220a4e7bbab1c9cfb36de841d039c9005058b4bb5fbc956916548a9524b451db

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