Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dca57da8b1c1df9…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 01:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 351f7fbb0f059f9548747e8ab545d86c SHA-1: 2b5734bf6fe0b2a579127762cc24dbbc0202ef27 SHA-256: 1dca57da8b1c1df9dc13b47badfaa7d6ec9d58c38a1cd4527ffbc31eb249c52c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high probability of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crysiq.ru/uplcv?utm_term=2014+accord+sport+manual PDF link annotation
    • http://adamlegal.com/userfiles/file/mavawanigaruje.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/nulezo.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/kadum.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/556f96329fd3235a1005eebd5c3b5f22/xababerigawaxulu.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/venowaxigatikenu.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/59075714675.pdfIn PDF document text
    • https://digireg.org/upload/10864420877.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/bilitelefenusebu.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/zivanadifejufukute.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/wibuzujamepisiloku.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719e7bd64cd---20058273497.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11328e7f53---57969499603.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/97777469229.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/400fcbb9071025aec2af465d4df6d3bb/metukamiwuxefositudovokij.pdfIn PDF document text
    • http://cortabellanews.com/userimages/mivojilinuvarije.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609846dded0ee---89520939521.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/miruxilumuwoxug.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/62896317044.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb64b08ad79---jiseze.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/52538151678.pdfIn PDF document text
    • http://chapelguild.com/images/usr/tumiminebebilafin.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e134ca073---16647023658.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a6bba25c---78762115035.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/doxebadutikiwexapoted.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_off0000c049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC049 10828 bytes
SHA-256: 3e9d631cd97812e1e1cbcd5ffb55a1a7b54faa914dd60274ae19168152453add
font_01_sfnt_off0000d95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 18060 bytes
SHA-256: b7388362fb93300d2aa61d6db9888e2ab9736c8c0fae624475928de5e5a21a82
font_02_sfnt_off000107fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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