Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b28f9603bbf39a9…

MALICIOUS

PDF

70.5 KB Created: 2021-09-04 01:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 198be8a59ffb3c0466f03e0ee6eb955f SHA-1: 4c9a526772f6bb33aaca7b65f1b54a0c30377bbf SHA-256: 6b28f9603bbf39a9abaa73921bf20c13d2fc8c3a4303be3590ba5ec4bbf6af1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608539a6f161a---gimutami.pdf In PDF document text
    • http://tasteofruraleurope.eu/upload/File/84947279813.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/vadinavuwatevuzuje.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/gimukiripagemobal.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/74970705355.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/sotiderebagufupadu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0450907b2---tutut.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210813_97C7868D7144BD57.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/86884857238.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/menamaminumixageza.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/a803e79cf20bc4dc1d3964e8585cbad5/6309342607.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/benibikakiruvafo.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/8qdgf0jju1o7nal8ub0poq6qa4/biliwamese.pdfIn PDF document text
    • https://allianztc.ro/files/file/43420198878.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/79418334521.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611ff20f86deb---46046827089.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/votalezozuzofufuzivudurep.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/54735416918.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/9563429817.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/17728890700.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607117b9d0b49---92830941022.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d50063256---luzubasubob.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/rorul.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55e18b578e---31001749804.pdfIn PDF document text
    • http://vejwun.cz/images/78207483032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=delhi+bye+laws+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_off0000b60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60B 15332 bytes
SHA-256: e73f8e2469a51dd64a56988a14bdcf1c6298d958a41f0b515a448afa8b8c5931
font_01_sfnt_off0000dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 10512 bytes
SHA-256: c5f31cec9540bb7b82880606208488a28d36a66c3a9a5a9b477f1a9e8010fb14
font_02_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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