Malicious PDF — malware analysis report

Static analysis result for SHA-256 1762ae1bb8cfbf2e…

MALICIOUS

PDF

102.8 KB Created: 2021-07-21 01:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f8284612ee984c05434e6c6a88bda52e SHA-1: 03917a6dff63a50e07ae89b65f35018e33ded287 SHA-256: 1762ae1bb8cfbf2e8499757c4cccbf5820175864b57c245e560a2f3765db0480
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a96e84dcbec---vekojibiwamexurixilig.pdf In PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/62077493519.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d1831fb55ce---1146519088.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085325b8c3d1---xejowamiketur.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/30266712386.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/navafifu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce36784de1---30121644954.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/nosezugesamafunibebetula.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/74405843514.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/xuvenowutosuwager.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/memafomosuditetu.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847644f9e7---50596538131.pdfIn PDF document text
    • http://lulanjina.net/upload/files/53880845749.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/zalitolefasipote.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2606988b9---mokefenagulo.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/movubuxebemu.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/36778555492.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/fisezuviza.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/linufidip.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39125f978---mujulawavilumotero.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/6f30a6a6aa7428513a9574de0d58a8fd/34968244743.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d4cd9b5f8---viduvemokobur.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bade83920c6---risezujulataxewiwu.pdfIn PDF document text
    • https://longhoang.vn/upload/files/42262963127.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/68971965375.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/37340795722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=wisconsin+personalized+license+plate+lookupPDF 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_off00012f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0E 17400 bytes
SHA-256: 5546f47d7162b220991de39eba89447557c44efa94dabb83f4992b825cd57090
font_01_sfnt_off00015c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9B 10752 bytes
SHA-256: c7514569dfad5aa297ef9174b35d5d41ae7ca9d45218a3e674ae4cdcf28d0c8c
font_02_sfnt_off00017589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1