Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeff84634e9ee400…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 01:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6145c98cf89e2dea000de38a4300b206 SHA-1: 2bc1efc46a9b3bd4864ed731d482b89c6529df31 SHA-256: aeff84634e9ee400a737582fe794b2dd0d7891dae4db70ec466d33bdb65d612a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=james+madison+federalist+10+worksheet PDF link annotation
    • http://studiopol.com/userfiles/files/63990408190.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/1ts21qekt1crumhj2u87gkgkh2/tudenaxijegakab.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/15361649584.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gapofawuzevobidaw.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-21/20210521191038173197.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/1atssgmfpadvnn846qbuit44mh/16352690539.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b30e9da041---79785379975.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/13934110217.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/93838689506.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/fabaxaritozoburugok.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/gemoteruxolesejutav.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/3956490899.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/90217654857.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/71729377144.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/ruselafugosovoxijugo.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/00auvb2bak1276argg9i1t0n08/liwidunaw.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/gazilusat.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a9e6701db---39991837793.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/duburiwimov.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/12358825774.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zazopezawi.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/59658995415.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/hv4aakeqbo79oelbnv324lrla5/rupameborenesakitokub.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/pojegafipo.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/99987731846.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_off0000cd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 10964 bytes
SHA-256: 48cb3d6590230a869c5aba7e3630fcb86e509107753b7ffcf57c6fe9a279472a
font_02_sfnt_off0000fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA1 17100 bytes
SHA-256: e593b25c809ccc651c2d718a8ea56f87525b58e79757d99a113ec8cee5a4b23b

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