Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2373afc2021dfd…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 13:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c0da6a00097557046055901bde6d710 SHA-1: 215a756acbc0081379210bd64b6d06c2b02d52cc SHA-256: aa2373afc2021dfd9fbfa9cf2a113ed42cf6fe2877a36693df021b2382ff3d23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm nature are common for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=game+offline+billiard PDF link annotation
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/73443661508.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/2375214344.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/bosutodisif.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/86842037902.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/93283556590.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/49730272649.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/33085101463.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/37629710905.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/31452785130.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4ee3d6a1---92869243779.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5db51f99c9f0289d80740425869d8c5e/patovibisobodibemug.pdfIn PDF document text
    • http://effekt-film.de/files/file/47008733086.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/sizisaludewixakuxivivi.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/27560577492.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/rebopokovipojamonagidur.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/70415739280.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/30f081ceea6793326ebec6f42b60550a/23215925188.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/11405181650.pdfIn PDF document text
    • http://greenld.com/userfiles/89512852027.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/83835201498.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/15468817782.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/jubax.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210901_212742_188.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/kadixajujupaxeduvojol.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/85605223369.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_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 18308 bytes
SHA-256: 75566edaf4e2b6dd49100c05f0747ebc5710fc30581a5975e36eb50a65765a3a
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 10428 bytes
SHA-256: b42477633e77d0a84f03148d5f7e1910dce7931dd34fc892a5e0f7588937ff6f

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