Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efda507f4aa19c9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 08:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2e7497f3c5e81fe909176889d7aff09 SHA-1: c8fc920c08d4f04e94fe918258236497419f3df7 SHA-256: 1efda507f4aa19c9c2234330992410f443170c0b03d10ec050ecd14caaee05ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=physically+based+rendering+4th+edition+pdf PDF link annotation
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2f66447b7d5fbad09133bbd99ad388df/92422316038.pdfIn PDF document text
    • http://novichiha.ru/pic/file/11207507721.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/jifexo.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/kugavisigogifu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ad66ba043ca2d361d728c8a2487516dd/gepenerujofuximeja.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/gewifajuwiweduven.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16071cbe4d34fd---nevuga.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/dozibija.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/57911438063.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/88353708171.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/14662091456.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bbc873470---kepukoxejepu.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e42e9ccfb---60747838787.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-16/20210516003321156197.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/tojufibejewowixadokukepiw.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a2dcaf367---maxamubegusux.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28647ae9eb---1605863786.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5104b2d9655659b33e76eaa63cf59cae/relowefixatokudadofip.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/bogasosemavumabelemop.pdfIn PDF document text
    • http://rilta.net/userfiles/files/44774693846.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/53364198897.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cecb04089d78a73fdf40d4365685d4cb/90137254455.pdfIn PDF document text
    • https://amblamy.ee/upload/file/xarutiworowu.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_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 11232 bytes
SHA-256: 481b2d9bdb501eaa8095880ba4c8a547c6a790fd309930abbc0b0d59b145077b
font_01_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 17264 bytes
SHA-256: 71ce9e4501626dcd714caeee04e22d6f0ea1d7e627411fd836440f8ad42bf373
font_02_sfnt_off00012179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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