Malicious PDF — malware analysis report

Static analysis result for SHA-256 503ae0a10cf5acdf…

MALICIOUS

PDF

68.6 KB Created: 2021-09-02 18:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43e86904c0e5339ba6770dbc9da3322b SHA-1: 44e384fa0f0e505c1994408f50c7bd98b103718a SHA-256: 503ae0a10cf5acdffeb43760791785281bfd6b221dc1bf9d918dbf809598b53a
156 Risk Score

Malware Insights

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

The sample was detected by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links indicate an attempt to redirect users to malicious content, likely exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://diegogenna.it/userfiles/files/wudinipususijasusuw.pdf In PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/410b1f2e819a47573585ca698aa4b623/26478324588.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c849136652---kidebitijamawekiresus.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/verovowakeberinugexali.pdfIn PDF document text
    • http://orem.mn/uploads/files/34531455684.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a416a828fd6---56622686507.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/18520292436.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/78089391407.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebc51248e---jenuropu.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/galeziliduvuropim.pdfIn PDF document text
    • https://alutat.com/data/file/92892386349.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfd93adcfc---94805531184.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c90534b49---27485251832.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/terimanuworanaro.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/29612637435.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/171552567834.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/12bkpet4fbtrr1ujiafe2p0654/58484006229.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/dopirovuku.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/63728502073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=convulsi%C3%B3n+febril+pdfPDF link annotation
    • 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_off0000aee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE3 10704 bytes
SHA-256: cde41360463d0baa35da2810daf03d0e047484813c2a5758c0df0893567ca464
font_01_sfnt_off0000c719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC719 14936 bytes
SHA-256: 835ce7298ecb4d6535d332c5129d4bca2bfc797b323565b266bacc00b902dfcf
font_02_sfnt_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1