Malicious PDF — malware analysis report

Static analysis result for SHA-256 991ec0920eec3173…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 02:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e20677f227c91ea6c5a4ea55b47c0119 SHA-1: a3c1454659bafc310e219bc030d1b82900184122 SHA-256: 991ec0920eec31738d900f3b10302a3f2177650caedeef6279016373be611506
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=comprehension+for+class+2+in+english+pdf PDF link annotation
    • http://kondicionery-elektrostal.ru/upload_picture/file/46082942104.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161386b8267ad4---lomesurowuvikemema.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/58441793046.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/52009491254.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210917095934.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/80486017055.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6c18dea1aaf0b646f8ac41e5e7165372/64990491078.pdfIn PDF document text
    • http://shamayachts.com/upload/file/doxekiduzap.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/xenolilotupares.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/46197209805.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/47104523746.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/64583397014.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/wewenemefufipipegupisag.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc5702b93---62690895801.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210916_242EF264C342C3A3.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/mozilapavuged.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/zekaxobeduzakisirixeli.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/dufamomagogogonapovo.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/733842d0a5dbf611159da1e3200d332a/babixuraxasuwodojotir.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/fiteji.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/41b3221f17745f071678297941e95986/65676752857.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/literunagezu.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/kufuxuxerupasulisil.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_off0000d867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 17952 bytes
SHA-256: 62f60f17ea6f549eb90bb62d96b874dc79b83f046a3f58ce984f4db41810876a
font_02_sfnt_off00011e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E84 11120 bytes
SHA-256: 41368b9e70ce1b8a6baaba6c931a77b2a4e81ad9078cf352bd21516d1828d00b

Open this report in the interactive analyzer, or submit your own file for analysis.