Malicious PDF — malware analysis report

Static analysis result for SHA-256 0faa5c2cc9cfeafd…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 19:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b536bef84a183750751ced7557e0e6c SHA-1: 4c985609e3fd89807dde5293bf8d94c86f0e1013 SHA-256: 0faa5c2cc9cfeafdca98b423b2c34a682992c96704e5507853acc6a687b7ec28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=apple+mac+reduce+size+of+pdf PDF link annotation
    • https://salvatoredivilio.it/userfiles/file/41486175259.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/dilefavonisewilifibi.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a6c3b6131---nemasetawijaxal.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090a901b65fd---55352309234.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/96684476165.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/49610896164.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786020acff1---mexovibuluzozamunedexudi.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/zerax.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/lukofafalop.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/94851482601.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22828c5697---85138716613.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/defulafewijoradapofiloga.pdfIn PDF document text
    • http://hojoairport.com/images/file/84148720869.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/20dde379e979e5fcaaa1144fa01fe4f2/68745509720.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/60091910751.pdfIn PDF document text
    • https://samudra99.com/contents//files/nixisunasigafesubu.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/warikutegezogowawix.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9b7d8b834063f6099bc9483eb7821005/jezivugezugoturufowabare.pdfIn PDF document text
    • http://orlickachata.cz/files/files/xudipujatewanusomomaj.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/28840147715.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/xazisixekaxotofit.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/rajoxobigezifum.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sedofo.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/zugudoli.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_off0000d745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 10720 bytes
SHA-256: 07f6ce3c9264475a16ef417699d98be15d3d2d4914e788b467ff4b02ba4d8eac
font_01_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 21504 bytes
SHA-256: 3c98ed12972dfd8ec26cde531e48c98ddd24096db73e607fa45ce7879239745e
font_02_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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