Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6c85ac717e3085…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 14:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d95d0495ecf88034c904957f0dde332 SHA-1: 802cf86d80adfea89d4d51eac517e2c1c7251b91 SHA-256: ba6c85ac717e3085fdd43b07e6dc5cc79e0d57a026c59c59e1a5fdfd9b801544
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. These links likely serve to redirect users to malicious websites or phishing pages, a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=which+cell+is+older+prokaryotic+or+eukaryotic PDF link annotation
    • http://eluvial.com/sites/all/sites/eluvial.com/files/11982630244.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132a612dd875---83785523543.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/91067841638.pdfIn PDF document text
    • http://hanleyresources.com/images/54794170404.pdfIn PDF document text
    • https://cartolmania.it/file/zusozufajinupugepaj.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b86d03f435---73992263348.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad9d3aee3---28709373266.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0d0enekr2mf3qcfqu6angbockv/zotomemusakixavumalu.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba6900d0b---xixipaletagetax.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/binujawapo.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/berub.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/79069094427.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/38234557541.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f600fd096cb202965a51f976e0b3803f/7242161385.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/28498757417.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/xegoj.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614015d27e31a---21860145646.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/6905rm13arknqlngibn089m0ir/91944096115.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/4035996604.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/57408672746.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/wofavebigopuxirefitowo.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_off0000d4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E6 17324 bytes
SHA-256: 89f43998106cc12e05049fdb85c2c39bf85f67ef85db40f587de6d44868f02d7
font_01_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 10808 bytes
SHA-256: 4454ef10d5391f053c3ef8ecdc74c0dac56e68d6032c9fa09a7c9b569f736277
font_02_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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