Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1436b05f335fef…

MALICIOUS

PDF

85.2 KB Created: 2021-06-29 02:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 40d4677d26f1f335b0b443b5c1a6efc7 SHA-1: 667b8f5a5f59290b2c8190e6cccfee0bffe7466f SHA-256: ef1436b05f335feff4d6f81c9094e51d3b90565f522d4e3b6b4e7e8954c02ea7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS upload directories. The presence of external URI indicators and the link farm heuristic suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/dd3d7e1c40b59910b0d3cb94cf0629bd/fegodemavobo.pdf In PDF document text
    • http://ks4073.com/file_media/file_image/file/pufefekinavab.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/1274114588.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/39697848265.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/75250668938.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/43969274142.pdfIn PDF document text
    • http://huntland.hu/upload/file/75153561889.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/kifufemodo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c45ea92d9e---63365152963.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/73492514361.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/86989028345.pdfIn PDF document text
    • https://dacola.com/upload/files/7614634526.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/90020250abd665c3eb12364f397e79cb/39852923957.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/rivawunido.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915266d1863---nonawifalukulonirubepemu.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c54296c460b---topafox.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef0d4d37f2---30054919070.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/126a72e911cf7979565d01add6ff3ca8/zagizovax.pdfIn PDF document text
    • http://teplospectr.ru/images/files/61646416324.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a73e79be9be---xofuretesaduvamus.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d22c818d14c---leleze.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/pomorevorujudukuzoxo.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e7f10ca2---79846799594.pdfIn PDF document text
    • https://appfacile.it/file/41301231755.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/e5b7a35d05f1fa169db137e1c9552c89/wijepawixenewud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+under+offer+mean+in+real+estatePDF 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_off0000e866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 17284 bytes
SHA-256: b2f49925a5dd3388b89953243a96a7a71c8ecb1a132eb4def270c9a3fd4bce68
font_02_sfnt_off00012d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 10712 bytes
SHA-256: 39008053ba3fed0a6fe63395736ee04eae00055993c04705e8dfc3f5dd099512

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