Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad16fb5461b2da4…

MALICIOUS

PDF

85.7 KB Created: 2021-09-10 19:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0fbf16bbd6ba0fa0a16dd260d962e12b SHA-1: 84266cb376c542aa903a5160238686147fbf0196 SHA-256: 5ad16fb5461b2da4989e058512e11d5a7b6c918035d39ea616bfafecc3ec48f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation and hosted on disposable infrastructure, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=aim+tool+for+8+ball+pool+mod PDF link annotation
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161396bf3940cb---sejagajogofupedur.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161305bdef02cf---39735890474.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/21315691663.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae4cc254c0---8080398032.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109060928339811.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613783a3948fb---41603120259.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/bugokusezat.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/11969619136.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/metogotaxafojenenazi.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/69483777966.pdfIn PDF document text
    • http://rsst77.ru/upload/files/26844586003.pdfIn PDF document text
    • http://gardatrans.com/content/Files/pojujetopukujowi.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/52173945830.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132a32bdbc5b---judalozoloxes.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/38245877224.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/xaziwexuxi.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/78887833286.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/kevorebaxobowatupuxuron.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/65528185667.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/jatemukovimumufato.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/dukakebag.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/28713599429.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/jutamatimefisojesunete.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_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 10584 bytes
SHA-256: 3f59e7f13559628331f6bbaa891bda6747b97797465e921282bfc504d6c49f15
font_02_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 20920 bytes
SHA-256: 44a0364ec9a6e1b9ad6bf6f831a0aee14f445e45af778e9de2b93fb5bdbbfcda

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