Malicious PDF — malware analysis report

Static analysis result for SHA-256 8168cd6cb0a1ad9b…

MALICIOUS

PDF

84.3 KB Created: 2021-08-25 00:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 55b94d12b9c9f103b44ad8d43cfab397 SHA-1: 2e0313451ce95cdb4bc5f95838c1ff45eb40a792 SHA-256: 8168cd6cb0a1ad9b611ce59d958069097082677b95e6f2301fd2bbe81ba9099c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute phishing content or malware. The presence of embedded URLs and the overall structure indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=the+oxford+solid+state+physics+basics+pdf PDF link annotation
    • http://chandigarhdatarecovery.com/files/file/46157344058.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/89455166964.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/budokesumexefedeba.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/topilukudunovopugodajuti.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210510103532.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16113b599b43b0---saxakafak.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/45748bfcc548bac21150f76abe0204c0/52310090905.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/pc8u40l2s8uto7628srmi0maik/tadudiwemesufidota.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e354b620a61---bujepa.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f18ad05b05---30332260542.pdfIn PDF document text
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/14552997671.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/45408942724.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/bevunivo.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/33036622684.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/9851036836.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5a40ea09d067639554c8ea02832153ed/21174328120.pdfIn PDF document text
    • https://ocw.tw/uploads/files/11684282750.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed7752034d1---mitedexok.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/c0ce2376763fbbad8415048791aad24c/rikowimeganel.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a528174f---61946609759.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce73156230d---lafog.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/bewubudiredanugekuda.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/9945643346.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_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 10932 bytes
SHA-256: 308e4bce2ded06ee020b28212a144b6a041cba6a956b6378aa3e3a63f3d99fbd
font_01_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 17612 bytes
SHA-256: 56e15147046fa6d5a16fafd90af79252d5dcbabebf7b6325ba2cd4a56377e85c

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