Malicious PDF — malware analysis report

Static analysis result for SHA-256 323efcb7c3b22ba2…

MALICIOUS

PDF

81.8 KB Created: 2021-08-24 10:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9e7625545bbbb17ab270fc24dba9c46 SHA-1: b23b7bb776ad5609f146228559eabab6a91f931c SHA-256: 323efcb7c3b22ba2551adc8b18df1efffc9c8b5e7baab2caf4d8b60f85c903b4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The file's structure as a link farm is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/587a197f5d8381367190a502c941928e/97809773947.pdf In PDF document text
    • http://imhkayseri.com/resimler/files/87205337369.pdfIn PDF document text
    • https://beaszemin.com/files/30865193076.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/t473772m2l28dn1l7hr275nuh9/voledafifonetewo.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/eovb621rek9guu1fjpsppff995/selanorududidedodag.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbf3ca83c---95138460937.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/mifujubupipataxukuwa.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc3daf2c48---39600914383.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/abb976b4a8957933c43f96a8d04c05ae/15095433954.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/suvanulakezuviz.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/juzofekoraberazur.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/dujulujidapefavar.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c90939c02---91206475560.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/fizinopugiwowok.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/503964c436286c5e8905e20ead246c35/78866666407.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/temikepebivakubotem.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16107d6996c323---sopozesagi.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/luger.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/zumusego.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/68010213879.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210630313_452916352.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/67812776452.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/jowivupulaxonowuz.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2d8d4bcd7e797568439f43fdd47721c5/38203895803.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a684b7cff2e---63103354373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=functional+structure+example+companyPDF 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://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_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 16080 bytes
SHA-256: 4706f9d71c874b57f6202cd154adc6e30459800009e3afe5ad719c766a696042
font_01_sfnt_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 10828 bytes
SHA-256: 15b9a9910633fa947fd9797a72914a3b2a74d05e094c77c517b21c862bc0bd6a

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