Malicious PDF — malware analysis report

Static analysis result for SHA-256 598ee4d813b3019d…

MALICIOUS

PDF

104.9 KB Created: 2021-08-04 04:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 76ae9c1c97afd70e0fe5ff4e09f9d878 SHA-1: 79711a5ed3aa272a420c390abca5df93d9446466 SHA-256: 598ee4d813b3019ddb2e2133df2ee6bc8e45291fdd0f55c2d14c2e54bf26e822
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. While no scripts were directly extracted, the PDF structure and its association with link farms suggest it is designed to redirect users to malicious or phishing content, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 http://montgomery71.com/clients/34132/File/mupezovosufefedavamake.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/434b0fb0821ea10273da102b421bd2d5/38291260078.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/zosurewaninijurefezaf.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081c713ca06c---mogulupukikebinivu.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/tizironurofubelovamig.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/cfd07309b937ac9267c3439dfc2648ad/medepekudozujadavinegup.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160972c20a4e1d---sijixawitezuvokus.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/3767321305.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/13281486317.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/57930640260.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cc2npu6h5399sfmtkjg8g7ck0j/dalivuwawijipibojijidare.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609068cda8fdd---53581448804.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a396843766e---zadapo.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/fukipakazujajudasiwe.pdfIn PDF document text
    • https://educhina.mn/editor/files/28175676057.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6690a769f157dc2be5656ef3ea15da09/dexudidi.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/36576946423.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/0e88hrpajeb10q7o41dcjrjcsi/28416742205.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/tebikozupenemitip.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ae164544e4a051a1dec725216e610d9e/fekitadunipizu.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/43743777753.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/nejerubotowex.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4717aebd7---79877576431.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43896abbab---56577059139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=libros+para+leer+online+para+ni%C3%B1os+en+inglesPDF 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
font_00_sfnt_off00011c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_01_sfnt_off0001326b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326B 19080 bytes
SHA-256: 3cc2ad05b693a07edabc72afbfda21974e42becc2920849903ed0e123eface86
font_02_sfnt_off00016332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16332 10632 bytes
SHA-256: cca370e7c4937b233982e875601b94fda5bc86968a256e132a12ffcf091e53f7
font_03_sfnt_off00017b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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