Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0bdfebbe62505cf…

MALICIOUS

PDF

73.5 KB Created: 2021-09-28 09:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9d4f5e456a83dd15ec759bf299703475 SHA-1: 99448507a7f32d94718e5283bf30a3257b07077b SHA-256: f0bdfebbe62505cf4cb824a03c913d92cbaeb891514a49fef5b4bca4f4446c4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://archism.ru/uplcv?utm_term=how+to+merge+duplicate+contacts+on+android PDF link annotation
    • http://madmojo.com/fckupload/file/90247348994.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/voximumuligexixuzisu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401cc269fef---27500645468.pdfIn PDF document text
    • https://coil.hk/upload/files/vavozawenosapavujitan.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613523ae0688a---mibenejef.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/misamorinawego.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/sumitunelavawaj.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/razamomejawodezotukip.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/30030810976.pdfIn PDF document text
    • http://premo.at/userfiles/file/54188272138.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/zenako.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/26053356420.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109280847499296.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/34452011879.pdfIn PDF document text
    • http://quranday.org/userfiles/file/44626803272.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/liwazitojekej.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/75891167938.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/demifopojos.pdfIn PDF document text
    • https://fong-cai.com/upload/files/14741599035.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/88011598674.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/68579668413.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161409561ef923---wadudiwefenonogiwaxabuba.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/lefofezola.pdfIn PDF document text
    • http://suaups.net/userfiles/file/86367181956.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910075243.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137e3d9554d3---porilegid.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_off0000b886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB886 17672 bytes
SHA-256: 88690e5778068078b426b02e256b9c30568e155c17922ae32b9dccb5305dd855
font_01_sfnt_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 11032 bytes
SHA-256: f781c22baee24eed7d4615ae182774567dabf0f04c8d531bfdb9f5dfd678f7dc
font_02_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1