Malicious PDF — malware analysis report

Static analysis result for SHA-256 573fb587617aecda…

MALICIOUS

PDF

85.0 KB Created: 2021-09-24 01:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52ede4889b09842e22d615906264a859 SHA-1: 1658a784aa5f8b2cef683366ac4ece357041058b SHA-256: 573fb587617aecda16d7bbf0d62ace19ad680a443b4746eb45fc458a2f73b890
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to various domains, some of which are hosted on compromised CMS upload storage. The presence of external URIs suggests an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=android+top+game+in+india PDF link annotation
    • http://ekorob.pl/userfiles/file/rebibivutu.pdfIn PDF document text
    • http://araratmebel.ru/img/file/nosovujirijujowimawomewo.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/dl6ghtg2uof6q1824v5cvgai3i/91673593509.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/23406290772.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/32656459632.pdfIn PDF document text
    • https://ntc-container.com/upload/files/gafasofirit.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/10684611983.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/70175238531.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/sazivixisobirilufiw.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/dokixigesededosix.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/7630501734.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/titosesasulibitozu.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/55118010511.pdfIn PDF document text
    • http://keitbg.com/images/files/dulidadi.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/56945530878.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7d8ca9917---6115293150.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/17996375980.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/20892152978.pdfIn PDF document text
    • http://laduses.nl/image/file/mubofajaka.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/guxapimuvuzesabuli.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/sagunif.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9d246a34---gotubus.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/51991639191.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/53211304650.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_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 10504 bytes
SHA-256: c09265c42beaa03491d9b2864f0baaf6f763b20509f51ecd948369270285f80a
font_02_sfnt_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 17060 bytes
SHA-256: 9903014d9dc050cd5b22312c111a780a137a91076c6c8c12a05290b5f06c4822