Malicious PDF — malware analysis report

Static analysis result for SHA-256 127a4e3f2d538224…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 06:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a63f1ee7d43f1d50cf145aeaa9720b76 SHA-1: 3dc32c0c54e22b0626e3fa99ef2da236ff209e6e SHA-256: 127a4e3f2d5382241ae02d9964b3b2f1a727fb1ab3bb9ffadaa0a76b9368dba7
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with several links pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links. No scripts were extracted, but the structure and URL analysis are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=how+to+undo+deleted+video+on+android PDF link annotation
    • http://mcutech.net/files/fozesupofewuwolesufefeg.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/87239598739.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/surabisoraju.pdfIn PDF document text
    • https://felicityokolo.com/file/11952476098.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109101519309923.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/74497181972.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/21023596622.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613821c8b9508---92828649956.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c8ab52a4e653adf70c6c44149c872571/86976407225.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/wojuratunumijapokak.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/71781585407.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/92621958818.pdfIn PDF document text
    • https://sambelteri.com/contents/files/rururexugukux.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/narusaxumivupogekega.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/rovupataxefawaxutiwam.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/12622758410.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/72553425240.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/13957730846.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a80dd8ba49e3cd4d0b65a3c7579f6d4d/15619972204.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/66614124160.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/pawugozofetabutokep.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613add11a06fb.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f594774234a1db0ca2f5127497e5647c/83966577376.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/48362777216.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4f252dff6---savatip.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/xudusavubo.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_off0000e6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 10316 bytes
SHA-256: 6adc5fe66362bcf12e08b6c270b80fb54ba9259afae3c5f357f850b7af85db82
font_01_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 18452 bytes
SHA-256: 6721fa12fc3ec843316e8f150791bbebda13d70d4dc7137540f821770981ed0d