Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f36e18eb802d64…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 15:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 892177c84d42b463f8acadef6508387d SHA-1: 6dd30a5cd5ef374cd188bb0457c40459b16eb012 SHA-256: 89f36e18eb802d647914b650f3607c3fe638c97e7f9ab782d2f085e6c3470cbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://dlzj.net/upload/files/2021053008331894199.pdf In PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/taxemobomatogefobinikewi.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/2c5e10798d882f596717c5b812a4469a/kitavi.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/63887356229.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e28f97b5eab---gavirodujozazewi.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0927da17273c6d075d412d943c533ab2/14330693591.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/25519028137.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf576bf0b6---46011919587.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/8cca6713800b711779453c25cee39067/76273611862.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/hqpsa4nqcmjc350u4000de25eu/93533511298.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5158186dc8---38392916210.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/balijexopamogolawirun.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/19782695723.pdfIn PDF document text
    • http://denledmpe.com/upload/files/devipixusi.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/numeriveremosapokare.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/jedimaxofozomokevageje.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/60215151843.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/sarasesojit.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1f0c47dd9b21e4d91cd7fe9e7a3729fc/25822286496.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6f10773d3---bipuxeva.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/boxibagudevidupuwidob.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/wimavafi.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/xatunopazivipeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hindustan+times+english+epaper+pdf+todayPDF 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_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 18064 bytes
SHA-256: 522b3b3a9b3984b936799c685407ba713af94478fa5dd1b5de15bad675b1db5d
font_02_sfnt_off000123de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DE 11152 bytes
SHA-256: 623f7b08906242c2a2825df4323294bdb01e369ab9e8ba77ba300b9181a884a0