Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3147092bf1169a4…

MALICIOUS

PDF

79.9 KB Created: 2021-10-06 02:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f9e38fe9b026ee04afa07194586af64e SHA-1: 25eb04e41cb78f9143c43b846bf04801d783a0ae SHA-256: b3147092bf1169a423bc1bd448e889e7a9f14321e4ac8ad2833764dd3851dea6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=three+to+the+power+of+8 PDF link annotation
    • https://lifecareproduct.in/ckfinder/userfiles/files/sazezedabulexurem.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/71015728636.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/kaxizozeluramimozaxutat.pdfIn PDF document text
    • https://cargobull.cz/res/file/fetuxolikuzojiginuwoxeli.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/76955398434.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/nebukib.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a0f49263ddfa88276ceb31867694d763/83456922972.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/82196940513.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/39ea2b45b0f48245a33c3a4e1f043001/5249189193.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/jujuxodaruvazegaropum.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/lonubulonitenezaw.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/xiradususunogamij.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161397e1a64eb7---gedesikanuluj.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/wuxutijubukigosapikada.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/nobelogena.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/62536823384.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/winujerizagazujojuse.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/603b4a3fe6996f285f16f6f65a885db7/fozadudedokixasejusitim.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/35544145957.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/57622589155.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/51743100122.pdfIn PDF document text
    • http://unseretochter.ch/images/file/44450731700.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c1e2a2cea---82405635104.pdfIn PDF document text
    • http://a-pluset.com/userfiles/54649423548.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_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 10140 bytes
SHA-256: a4845e1b809a09856baa2c407f89ceaa3beeaafb1415aeff03563cebbd29a4e8
font_02_sfnt_off0001027b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 18288 bytes
SHA-256: 871f46a3bb9a99f2adcee84fb42d7019fe02194fdb51f082b8d05c6fc31167d1