Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9a7bd12f167f85…

MALICIOUS

PDF

74.9 KB Created: 2021-09-20 18:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7607e3a235def79f8522b8938f3fd51d SHA-1: d611c9da0a50cbe2de2bca720ec3f09beb8334a7 SHA-256: bf9a7bd12f167f8585fc9614c167a0912a5aaf9b8933d343cf122244af6acb19
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers also flagged it as malicious. It contains numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=second+class+citizen+by+buchi+emecheta+pdf+download PDF link annotation
    • https://mmeasar.com/mmeasarfiles/file/71717034613.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614833b8d94f8---lijevapaxo.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/87832520630.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/98310172118.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/50812289913.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/68835570105.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/lezoxapuna.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/fipeluvadijafi.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/295986530.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/94369203693.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/nixumimedeluxopirifil.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614167525cf7f---fidifagelasibomedixakoja.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/32369757983.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/nafaxa.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/jugomimedo.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/43225448377.pdfIn PDF document text
    • http://rayanchem.com/d/files/denetazusonesararukoxo.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/wekiv.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1a43dee47e567b6c969b621b8ae51a06/75745757649.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/ronewetejatibimam.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/52803810017.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/42084278007.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/tisusodowilinanewas.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614684c4e7c39---78707174406.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/wemuxegavajexekifu.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/gadimi.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_off0000c0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 11360 bytes
SHA-256: 0e8190102cc8d1404aa07a15463245e9390dada81a15fe4a45c152b8fcf6dac9
font_02_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 16316 bytes
SHA-256: 4cf39b801e9cc93f3f13cc94884a1e7d29d6da40f6a98d24c23c7af55d6443f8

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