Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03648c93b1d8d77…

MALICIOUS

PDF

81.2 KB Created: 2021-08-30 15:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b7d617346c534f024634d436721cb43 SHA-1: 7d9ef46d0dee54a146e6b629a3233c4965458826 SHA-256: e03648c93b1d8d77f87ef1a4dd6cba60785b0c0d636d619efc40e0c9be8f2bf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The presence of multiple external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=giving+directions+listening+exercises PDF link annotation
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/o3b2tkj56bhfkcq2knou6d335f/84820061862.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/pofirakeju.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/sipigakota.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/q0fdqd0b8q5ikjflghgi5n59m1/litedujomigananite.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cd7cac707312d38472d0079bca1e4ea1/godiluwolutus.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/efef3602d811c81aaee26c5adf0eaad9/19131440240.pdfIn PDF document text
    • http://svx.su/ffile/file/10386696565.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/sakifejufo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62cd7b7039---zegigatikufozugaxunebavi.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/dazamezenozuxugazuliz.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b71194e5ae1---80698305885.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110028cce970---64056297023.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b6e5b9762---48398470658.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/bpva6gpd4d51ke83ojopjh9rg6/mososa.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/73936472144.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/88042727039.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/65968803041.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/46122052450.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/279b4700ae11792613e58c8af21eff3d/44692191481.pdfIn PDF document text
    • http://ciskmv.com/css/file/mijujunuluz.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5656a0c080---nuxububuzikami.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_off0000d685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD685 10592 bytes
SHA-256: af87d31e8f1d27e49c0dbe5e4a56912cf843882c3b87e5ffd57f8de7c8e60285
font_01_sfnt_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 17832 bytes
SHA-256: a0283afc45d7d7a4d7a2e6488e7f277e8fbbba2c0feeb07066e6593ca67ae015

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