Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f648a382943fc5…

MALICIOUS

PDF

86.6 KB Created: 2021-08-12 02:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9719b2a7cc6b65e07760b16be079c85 SHA-1: fd25b97362afbc4af0dc098bf3482e6a0709db19 SHA-256: 86f648a382943fc57647e91e4ee3f7c2c38663e4cefc2c5d486c3756cab0a780
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple URLs hosted on compromised WordPress upload storage. These links are designed to appear as legitimate files but likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c30a3d77f---48235848106.pdf In PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/191fd0d6cb58b68ccd80d26ba31afc35/81082746014.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/1u5chhc9d9eakjbiaj87sf8a18/8111570648.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8ba8d551e---21548557592.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/ce1c8e03742f351249223c03d8c6af07/pezezipoxipitoge.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/tikovidapojigavopusuline.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae85f54bcb6---26006597875.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/ruduluzusakowi.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/wolokupajifu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859d0b8677c---91708406924.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607815490e1e5---pezero.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/bm79vgclm5tcvihj8bjmh602s9/34502447660.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/411e4c6efcfdc97fa48ac274e35a925c/66086078235.pdfIn PDF document text
    • https://ingmarcomantovani.it/file/xokarodepiturejasemoboga.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/18905559247.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/9rd4namgtkc1gvbda66pjn74c0/vesugomir.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4da6327511---83033393398.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fb7134d42---40582161600.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/eba8524f510cb79bc5e42c4825fbc12b/rupowabuk.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/21379858987.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/bopagukugejemotawezoj.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/wukakot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+a+cool+marble+runPDF 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_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 10540 bytes
SHA-256: 091c9f41bd85559ef59c6577b23df094ac8d6850a6518e7051324ef541ca29cd
font_01_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 17484 bytes
SHA-256: d23faa25c94c1250f84911a936b3b3508254b4e363c5305c51404dc6477f01de

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