Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff3941c3089336d…

MALICIOUS

PDF

100.4 KB Created: 2021-07-14 04:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 71b0fabcbad66499626484a5fe29bfa9 SHA-1: fc6a68fcd5432b0202a37d78bfb3e9f7563b24a4 SHA-256: 9ff3941c3089336d2e7ced5b76a519f8d751add0edc1e437b52a5259a7edff6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the structure and URL findings are sufficient to classify this as a phishing or redirection attack.

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 http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af379f18f31---wolatigi.pdf In PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71a174a66---36917892376.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/5499066978.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/cg4uvueljjkcfp04ojl7oj1mko/47102618357.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/bizobivekalipavunaxedibep.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160708e4e9b446---93525882573.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/rojumezigenimofafo.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4634f7af30---25953611937.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b5a9db549---sotopudebugebon.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2976c521357e715533c446438a72aab2/newafikenuvexolejoru.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/buguxadeputivojovepip.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160724a2d1d310---dinuruxodepururokituvi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ks0ne8i60frcfk75afum9udbub/fapuduvumaxagafilor.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d0598aad8d7---wijalewelogevifexugopoda.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/sefuxofure.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1cfo5r3imb7o4o841gm9jfh1e6/35226721528.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/46859901575.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608103aa61b6d---ropevonojonulik.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/pomomupivomewepir.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/89533233898.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902edbc3257---jagetiluzavibip.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/1668733953f2bd23a7552c638f8a5b5e/gazefuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bible+verses+about+food+we+should+eatPDF 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_off0001257a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257A 10792 bytes
SHA-256: c9006c9b1c4229a662ce0cecf31bbe20944d3f851817872b8586a957765ec807
font_01_sfnt_off00013e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E87 17732 bytes
SHA-256: 0cdc25f536eb23a95474d985821ad64b4373578aa6a349f6c602a5fbc8b9fd2d
font_02_sfnt_off00016cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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