Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a790ce8d75fd2c…

MALICIOUS

PDF

149.6 KB Created: 2021-08-08 22:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c783cfb47f191d7a54d74d7b3aed3b0 SHA-1: 8f299f6b61b3addce531ad8e5c4c648dc97c16f6 SHA-256: c1a790ce8d75fd2c5a219107e517e3e76956abb510c610a04a336444cf1f889a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://clinicscrm.com/img/files/46260421611.pdf In PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/fejivudunagezofalebijolam.pdfIn PDF document text
    • http://webursitet.org/Files/file/64359090676.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/kojixafoneleditametaluj.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3acd8b8eb---daxavogajetij.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62238765fd---vuwupokemikopokisujanuze.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7f3kt6psndne4lo79sekqh4to0/76553356691.pdfIn PDF document text
    • http://gardatrans.com/content/Files/fovalitorofulimufonevuket.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/15476917333.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/vrcasahn714oi1gu3hgm5rpo86/43972004723.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/5flbna798rev9cajc69d8075fv/99748998553.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/08e3c86772339110b5f0b64261da9803/daxija.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/vaxak.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/14391545081.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/jipatid.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/mizumusotavamuzap.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610371ccabdc2---gumawunadamabirebupovufar.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/kokudewosegogaxenirazub.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b372d0dab7---legebam.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/50048758679.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/wapixa.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/gozawadedivixigikunavos.pdfIn PDF document text
    • http://palami.by/images/file/5861506011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=warrior+cats+medicine+cat+herbs+and+their+usesPDF link annotation
    • https://lapdonline.org/file/gezegekaram.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_off0001e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7A1 18064 bytes
SHA-256: 2ee09af5305aa49a388b8e7d48f0db245394906a9a5f7f7e84356e7ea157bab2
font_01_sfnt_off00021672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E89 10820 bytes
SHA-256: 803bef08ebd6aa3f5ed0e385a12ac5f33964483f26fe81025b48b73f6f8b3291