Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef31d6bd4805db24…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 12:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 07397c829ca47ab74ddf5d8687ad90fe SHA-1: 87a8d5bd95faa08b7c28e7ea92a1b2ec7f8ccd62 SHA-256: ef31d6bd4805db2443601a1b511d64e818362d218dfd14775c9c62281c35d3b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://krisoc.ru/uplcv?utm_term=le+pouvoir+de+la+pens%C3%A9e+positive+pdf+gratuit PDF link annotation
    • http://mea-travel.pl/userfiles/file/54893834492.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/36648738687.pdfIn PDF document text
    • http://geose.ru/userfiles/file/defupuwatitapojafovud.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/25455491712.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4530a41363---19017350465.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/fafajepobufofujazasotuma.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/688485937.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c8d230a0d46---75895807705.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16103d0aeba7ad---27545128550.pdfIn PDF document text
    • http://halaljones.com/uploads/files/viwesudaxakosenamare.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/fusaxunudodod.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/gewelunojoxa.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160860fe59930a---nuvesujoval.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f62f130a984b6baf8a76de0eb16c706f/mufobamotevinabo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8adec47db---roxerugovizudolebeke.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/gugizodajuk.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/jozezisoxapovojofejaxamu.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/31725131380.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/pavetelojosotikanumuzefo.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09df8c0ef6---ranomaremodo.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6vp4eq3l29bece29qfj5i3fln7/wavarofazagofevijifusana.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/84109000914.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/62800452085.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_off0000d552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD552 19408 bytes
SHA-256: 69831e463cedb41bb8a698eadafb0b071d0879a1d0f6f85d24efa30f2589db11
font_01_sfnt_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 10948 bytes
SHA-256: d09df861d46415fa2c20bb74d55e50b18ed74b958cd9162e118c842d113eef80
font_02_sfnt_off00011f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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