Malicious PDF — malware analysis report

Static analysis result for SHA-256 4803c29dd4c3d859…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 02:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 70936406ea24fad7f73cc80aef88d1fd SHA-1: 24cac46d426a62afa7d23a66d1a556ee99d1b355 SHA-256: 4803c29dd4c3d8596f8c0eb7b3fd1d3b17325a1ebece42d9f4074ee6cbc23400
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to unknown or potentially compromised domains. Heuristics indicate this is a link farm, with some links pointing to WordPress upload storage, suggesting an attempt to obscure the true hosting of malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://binhvi.com/upload/files/jonaduza.pdf In PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/93455198257.pdfIn PDF document text
    • http://capri.lt/userfiles/files/jesalumegufetogokalukowez.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b9e10e76e---zefazalowi.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/tedamolut.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/nizuvafifivuki.pdfIn PDF document text
    • https://limmaginebistrot.com/file/dewit.pdfIn PDF document text
    • https://dineflon.com//files/97582376816.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/uhdks77fp93rkrkeg3jr4bk8rp/87198749477.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/21916574007.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/13446321519.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/zobilizokitasive.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/nedonajaxi.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/9diffpjpmblqentfq1ouvd6b10/wadasiwegubiwex.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/49747111938.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613151560809e---xavelufipilekirosa.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161218212ae25a---jabexabewulos.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/xujevotowev.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075b35e6b064---rugelubanesofitag.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/mukajuzofirukepowan.pdfIn PDF document text
    • http://yoron.net/up/files/vuleligapilumele.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/79745872019.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/mirifirowujokovaxap.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/gibebemizuf.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c98933bd015---fikumidelise.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/nubizabulawavik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=conteneurisation+des+marchandises+pdfPDF 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_off0000d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 18664 bytes
SHA-256: 9b4aebc6c179f66329978bf8fa24757420cbe71246de368395aec3238126bce7
font_01_sfnt_off000107a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 10972 bytes
SHA-256: 7436596cbb17a29a50f53e261e7e33b0b1912782f02fcb6818e8e7fb551da820
font_02_sfnt_off000120ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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