Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38652beec5466ca…

MALICIOUS

PDF

92.1 KB Created: 2021-08-02 23:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed226cf129dbcc97a2ba8a476683a58a SHA-1: 07bd4bb8afe7baeaef8a170bd8aea13f4767b94f SHA-256: e38652beec5466cab4edd680f4edc669f9b97bac68b31c8f7b157cecb58ea876
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://anpheatingandac.com/nbloom/fckuploads/file/94079010530.pdf In PDF document text
    • https://a2designbg.com/userfiles/file/solidofelarita.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/nakikokufo.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/5pbrun0pr7t2crrjm1j4rvjjt2/84581783579.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/jefapurudi.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/fixiguk.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607897d9d23f5---fefagosixazaderot.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/lipabuzuzelupilifaxij.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/suturerefusojugopixesadu.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/93337515320.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d35598170---70767934256.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/juluxon.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/24765447413.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/xajatatodis.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/mb54jout0t43fra66oo3rgbpk0/80369366192.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c35de90f399---25603959599.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/kijegakopef.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/11516802926.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/84495959457.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076c077019ef---55483502837.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c20b0393a3---ralafi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a624950fdb2a1331134e5b5ae80089a8/72793626047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=questions+and+answers+for+part+1+of+ielts+speaking+testPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000e6af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE6AF 18536 bytes
SHA-256: 1427dcf37ea9ce17d925903d6866fbf72e3daafd565f3933e6b0548183205245
font_01_sfnt_off000103d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 11064 bytes
SHA-256: b7031158e1605a64a9c2f62de48c12b3946ecf8ad31835e4c9a6370b1fceaa6a
font_02_sfnt_off00011dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 16740 bytes
SHA-256: de4751ef750279e55a5516da65cbdd2b9ff4c510d580fe8006e7c3c0ba83677e
font_03_sfnt_off000148f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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