Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7482797d1f895e…

MALICIOUS

PDF

85.8 KB Created: 2021-09-14 09:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 358c4ec5b5a8df47ffa0eccb8e0c6cae SHA-1: 2c3eb0d5f15c8cecd40575cbbcd093d28a1fbaf2 SHA-256: 9a7482797d1f895edd7ced9b01a8f1f75f659edd22e55752637df37ce2d56306
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be associated with compromised content management systems or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristic firings and URL analysis are sufficient to determine its function as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=how+to+see+recent+activity+on+android+phone PDF link annotation
    • http://protezas.lt/i/File/16328331970.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4a22a91f---39994020260.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8047d7394ec21cb74ce33c7e28861571/38701636806.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/89070212438.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/38119925412.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1630537936.pdfIn PDF document text
    • http://cartopack.com/Images/file/wemonadutogedotuligegujar.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/12905709182.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/bugidobuseza.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/sugakogivajugesiwur.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d49cbd0fe4---zunorotiwegafilupatut.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/dobuwikekivugijelexu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613148c0a1118---lovomixedaronologufob.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090307384557.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a8f9a8b7---pobarosam.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130dce5ee9c3---gujivetodunafobalom.pdfIn PDF document text
    • http://superazs.ru/images/news/file/19884998994.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/26179574515.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/65274174786.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/91845267353.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/93324134964.pdfIn PDF document text
    • https://digireg.si/upload/dudotudukunarazimi.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109011410016859.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_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 17620 bytes
SHA-256: 0d55cb3a19600810157ad21bbf241cedee51fc129aedd894fa18e86890cbb8f5
font_02_sfnt_off00013016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13016 10824 bytes
SHA-256: 5f9cf5a4244ef3f5695f58c2a7f89482da30273f192edc85ee89e218be19e072

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