Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0524dde7ced42f2…

MALICIOUS

PDF

94.3 KB Created: 2021-08-10 03:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4c73272c8572ae0003af366e57823e71 SHA-1: 94c23a0fc6d0ed4738baf3abef843856edc2a8ce SHA-256: b0524dde7ced42f25bf002b326792b08bf2ce2ef27a30759b7e5d699b331e87e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

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 https://dusunceokulu.net/resimler/files/9721894489.pdf In PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/tbkdj7v4t47setkte1bfm3uok2/81731185679.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/16777734120.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1538d40f---dufipaliloboguri.pdfIn PDF document text
    • https://longhoang.vn/upload/files/zagijexetowizafafowoxape.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/94137851694.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/1a220a4c727bf6b811cbfc8ba4b47226/juribilubafakokeb.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/rotibeliworomugebu.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9cc179cf---48385623777.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16085b0d9ba55e---58336016479.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/10794430453.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609552986e02b---447517760.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0d032bcf---99720441027.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ee66284499b9f42109d95743b08ebc8a/sixowega.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/57082084477.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/43748670557.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609278f73926d---dojipaluxejanoki.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/51511039027.pdfIn PDF document text
    • http://prosquash.by/data/robovoromokimovam.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/kosofeximafamisibiwesaje.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767ff03b208---32427228122.pdfIn PDF document text
    • http://plncse.hu/php_data/file/bonojinuxeba.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/samumikotuvufuzukivuxelam.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/79034885036.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f006e9237b---41588315035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hogwarts+acceptance+letter+template+free+printablePDF 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_off00010afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 11040 bytes
SHA-256: 71f9db3870857c6ec49bf14db7245d0ad88cda032f3d616a111a101c863fde17
font_02_sfnt_off00013c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8F 17352 bytes
SHA-256: 8b00aed562eba32c2f896afabbc86e5bf8c01ea007373dab342bc72678d51290

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