Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d84334b85e5436…

MALICIOUS

PDF

86.4 KB Created: 2021-08-10 06:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a90ba0fae1eb894b98f632c20a01e53b SHA-1: d00ebb14656db0794e0ea2162082bafda45a70de SHA-256: 24d84334b85e5436d64c147959843dd75eb42aada89f3c65fc9c33be39938388
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many hosted on compromised CMS upload storage or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=tourism+marketing+textbook+pdf PDF link annotation
    • http://eperon-kochersberg.com/img_db/48982688980.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/lubegawixew.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751c478f279---jibaridekipubetosojasuvej.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ac03c1bffa1---52814191192.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/xidudejepepo.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/c331e9f9a642a6422dc5e89910b47221/44531213334.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/63534693243.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///tasape.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d3a3ed031---kogikop.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a23b1f1093---bokijowofodawerekim.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53b903118---70335193061.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc57e45d17---25287601572.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/2689722060.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a501c8a8bd823e935ded11e8da7eb91c/64669928220.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/52spuuo403abu2bmpuquriakd8/42456879022.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/43498620039.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f54eba3dd3a---78943644746.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/pruo2bp0k6ef2b6j6la5u2q5e6/81291706445.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/91484576115.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/55067107923.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/miwap.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/7239958214.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_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 18236 bytes
SHA-256: 2e65f2c6bfec84dd24536482f07f19055ee567f7236b56a358f83428d7f26c1d
font_01_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 11192 bytes
SHA-256: b1ce78c923f59a8e9f9f35d22ecbac30b1b6c6b051798a6af7e6a6dc02249e6b
font_02_sfnt_off0001334d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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