Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a32dca4b23c8a8a…

MALICIOUS

PDF

87.9 KB Created: 2021-07-30 07:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c1df255d6dee6083a5f1dd30dc739dd SHA-1: fead08464f63171d5cce82005256e293ba19c598 SHA-256: 2a32dca4b23c8a8a9b41b973df363a1bcf7b4a2ee9ee64c631b5bcf830764daa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This pattern suggests a phishing or malware distribution campaign where the initial PDF acts as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16088860e7991a---17634825046.pdf In PDF document text
    • https://synersys.fr/contenu/file/kiwogolewewurakutok.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1g4pam548s49mijne6of1j82c7/vanulofolomesuroputuge.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/zuguvulawosot.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/dolobaruzasufemekaduj.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/6748278992.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161025de7e7098---ponirugig.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/wesisukunodujuxozu.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/30379250331.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079fef86a8c9---93440836436.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d8e4da0445d3fd137292ccb3d8a74574/37136811141.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/33856173179.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/a356e5f9e05af806c1e904364b60243e/wefiwoxedidetubolodeg.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085bba27bfa5---lenoxa.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/qihqds5hkeifofuerunhe7r5t2/32247370752.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa23b88d334---fabej.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/21989857627.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/medugedid.pdfIn PDF document text
    • http://realloans.com/clients/73966/File/69503223173.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/retesed.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/12898703464.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/pakukozepevawazawoxux.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1605e53a60d0eb273234dfcd5b895a64/13353923674.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b70864e8ad---kamomifinufupanosev.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/galadurukata.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/julokefiwagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=etapas+juicio+sucesorio+intestamentario+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 17940 bytes
SHA-256: 764a777f9aba21a93bfc1c8723a4ab61380858dfa5f83931a820230a64146d6f
font_02_sfnt_off0001376c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376C 10948 bytes
SHA-256: f5d83ba2bdff3b3bd7c1ddb3ba8e8a34f84c4a1c26579770bb9f07cc2b510f02

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