Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1560536781f8cf…

MALICIOUS

PDF

81.8 KB Created: 2021-08-03 08:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8353ab87e916ef903aaa93f672be3bb9 SHA-1: ef0b6fc8984c351dd39ec030377a0c6833f6fb26 SHA-256: de1560536781f8cf2921e3b1afd3e6e1c6f46b1f1055a6907fa4ac7ea7c7dd93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware delivery attempt. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b6326c443a47ae96b10f0cc75f5db2fe/tuwotela.pdf In PDF document text
    • http://owv-sad.de/userfiles/files/paferutulawumidomenapad.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cabfd00cafd---58029815226.pdfIn PDF document text
    • http://lucavolpicella.it/userfiles/files/25025038124.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5646922a8---14958376215.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/91255464154.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210723_095924.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d9126abf0---94713499711.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcd0ba6111---rofubugakuxu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/lkari64caj25fr89n8gi6nrvhp/vafutajutedozanewaxinowux.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/bujaxexufugotarelir.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/96253834235.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5567def1d---91899078906.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/28405962375.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/66307rj627uqaktng0r2ck3792/kipijapujef.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0305770f78---biziloluper.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/lnkmcslpj5vakm08g9vl3o7f54/92436163929.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/gogivinasoduluga.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebde39bfda---9215216184.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/61222179896.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/76224372758.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/44147367129.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/xafurutipakonufazuf.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924f9887018---mufudarogilefinukilojeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=solucionario+matematicas+5+primariaPDF 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_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 17216 bytes
SHA-256: 98027f4d78c4890a389d69b00d15ff4aa4de48bb0345cdf7102be36260761fb5
font_01_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 10844 bytes
SHA-256: 801776253b5807e546e4e7d2c4f6add8eeff1d37b5223c75a38d5f6b1637dd04
font_02_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1