Malicious PDF — malware analysis report

Static analysis result for SHA-256 e524443c88bbfee9…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 00:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1359fe9ea6d3d71769f184401c41e0e SHA-1: db316e19f3fe1c4817d75c4568cc71a2c8493e12 SHA-256: e524443c88bbfee906ce0814434de9916950ea2c97ddc6c70c2d1c3ef5d340fe
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to disposable or potentially compromised domains. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond acting as a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rasathantrananotech.com/ckfinder/userfiles/files/58189586221.pdf In PDF document text
    • http://izeninfo.net/admin/upload/files/75982753133.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/birolefegikif.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/14670586998.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/taxovoj.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/miralesiwulite.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac04e7ef2---lejomu.pdfIn PDF document text
    • http://vipdiler.ru/files/file/maniwumas.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/wewuvutoni.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/tivakodatoxurewo.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/27397048634.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161425852d2f75---jekumojusanorolabop.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/kikexunufovezewukobawoluw.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/81328497269.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a696f9ea9c0245b83c6a95ba233dcad9/73385677268.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/68337121880.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/rekix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614513c2ca08b---99291153612.pdfIn PDF document text
    • http://tykhchem.com/upload/files/44200070614.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/zujorofakemonapudiruwaj.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/revurodexovakisev.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/88843257103.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/mevatakogimibujerawanu.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/28473179088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+can+you+do+with+a+name+tag+in+minecraftPDF 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_off0000b0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EF 16828 bytes
SHA-256: 6f190c8d879e0f42f3fec6c9e08a3b2f8f2f74422937a87859d408edf5693ca7
font_02_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 11000 bytes
SHA-256: 94dd89cd7e913242544018c5e89d443e7a21740691c4fb50e8355aa2bbd79eb4

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