Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5f6ca99208d55b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 13:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 425097d34ddcc05cc32e20525874a83d SHA-1: 7560bee1317f2b9e3a0eb5cfc42e4290ff9a1598 SHA-256: 5b5f6ca99208d55b9093de8f10f8364bf5c2d6d98cb414696e051a96dc607d47
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm strategy. Heuristics indicate these links are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=cafe+south+william+street PDF link annotation
    • http://axiomestates.com/userfiles/file/87196686813.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/zerugidalejupimofopaw.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/kubigelojogosenezusaf.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/wazetuterezevutenav.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/92421437151.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/57ddd05a4c155f53cf09bcd93f8a47ff/63164215944.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/fadejefijuk.pdfIn PDF document text
    • https://argumentua.com/i/file/bijogat.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/noxuwuromudimigapamowejor.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/56378619292.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/gozol.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/zabep.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/xatomotitepoxozu.pdfIn PDF document text
    • https://patc.fr/imagesfile/69862641194.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/56129728934.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/87710742160.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/3qh5mb5nbo8euealp3cj7i3ot6/96239193963.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/12219068529.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6f1fdffd4d7327cf07afcb1f5aab8c07/214631353.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/sujigetazopopez.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac661784646---60211121627.pdfIn PDF document text
    • http://candientushinko.com/images/file/ravumosokosudut.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099bd5feb49d---21069705164.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1ddbf3cb594697cf740c830be587a22f/35255131661.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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 10592 bytes
SHA-256: 402c75d92981b362d6c4f24541e649fc676b2d58c1ce6c134b1515ecfd5c0fc4
font_01_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 18272 bytes
SHA-256: bca9b55143426df9b7def831663920d8785a3cc8c838f135b55649c1419c8a82

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