Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7b31146a0bf36c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 14:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df032752dbed76fe2c4e06ac3468855b SHA-1: f20b7297bffc1a9e57bbe0822d83e80243407662 SHA-256: eb7b31146a0bf36c2c8c428438c4a7d88a42d93e5ec7e4601cb0f4f535feb82b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to potentially compromised websites or link farms, as indicated by heuristics like PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://otczenacts.com/media/files/15305639690.pdf In PDF document text
    • http://pkynfe.net/userfiles/file/17276401892.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202108310536529403.pdfIn PDF document text
    • https://phr4u.com/files/37664210040.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/75022587321.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/39951858305.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/vikugajafepigurowikubum.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/vepobatose.pdfIn PDF document text
    • http://nature-revive.org/files/file/xadibesoxubuxulomebeda.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65b377cf9cf22639bdcdd30413776f15/9632577649.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/radasovi.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/97174686651.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/20493943420.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/74744509594.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/zidimux.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/dizewunedizawimutedol.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/vatenateg.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a800ace9fed---46936837795.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/42891630138.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/30e5d50064839149f5ea0ae546398833/watipub.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/64975661648.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7703adc5fa2cac3ec7ba5c5c561c2172/reban.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1896ee5de---dakepupevu.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/9623881205.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/es9cr72it6tq301ngjn6lc95t7/bifalif.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0873ea5bc2---tovavalulupikur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=nektar+panorama+p1+manual+pdfPDF link annotation
    • 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_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 18292 bytes
SHA-256: 92710f2cc0b8497e02e8e099ad666294ca97128029237d41608633d6e669dd97
font_01_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 10620 bytes
SHA-256: 17265cc41e6884d386c84f275bdbd2d2894794c24deefc764eaa784fe85495f9
font_02_sfnt_off00011b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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