Malicious PDF — malware analysis report

Static analysis result for SHA-256 32e30bfccec51f04…

MALICIOUS

PDF

89.3 KB Created: 2021-09-09 03:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 910bc1fbb6955f45df4c79112923d474 SHA-1: 5bd9ec3a25f6cac9193af50744133b68d44f0973 SHA-256: 32e30bfccec51f0482befe1893311485670e40769d9536168523dfac3bde0730
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDFs hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://archism.ru/uplcv?utm_term=correct+order+of+the+planets+from+the+sun PDF link annotation
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/61482724388.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/kasavunipuwufoli.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4e9e4e1ce3a05ea4abd85473de7f67ee/waregejikewag.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613578f7940f1---62799858517.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/piwaruxilifokowakegapiret.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/tonidemidazobawozu.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/kiwekafojugelizowumupi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c7a85cc4c155aff81b542d34c005647c/44442352343.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/sejudevigon.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/91298927756.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/71118775832.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/dexosobazefudekixob.pdfIn PDF document text
    • http://taigesw.com/upload/files/39283201204.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137675e79422---vebifajazivibarog.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/65721324546.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/pukovebagapumubi.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/wimipew.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/99071107262.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/73148384220.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/tejedovijonibikizevakivuf.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1be17f5e5---jixifusitel.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351e405dead---38221169533.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/34181715256.pdfIn PDF document text
    • http://budropol.de/Upload/file/xukaselezofesenozebaroved.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/wakitifenasegop.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/nixexuxaloxo.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_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 17656 bytes
SHA-256: e21fce2bab98825bae05b35f948971b0179b250a13cf28ee512b5418ad367136
font_01_sfnt_off00012647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12647 10924 bytes
SHA-256: 905db0099a58daf9a040d761de8be9ec70d18c20a1d275c7c4a91232674bcf99
font_02_sfnt_off00013f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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