Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64247b460483f12…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 03:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f083f8cc867089554611cbff18924b7e SHA-1: 3ea36397ea7c13c16801d87f1e5ce42a533085f1 SHA-256: b64247b460483f1273bb732359747c110c619a828a33ae973cf69c792d50629c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised upload storage or disposable hosting, indicative of a link farm designed to redirect users. Heuristics and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan variant, with ML classification confirming a high probability of maliciousness. The primary attack pattern involves luring users through a malicious attachment to a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://misosmile.com/upload/editor/files/31748460067.pdf In PDF document text
    • http://sbcnepal.com/images/file/2573774482.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/1563050976.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/gafix.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/98837740634.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/63772776351.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/nitupevanekewoxomimanif.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a7075095fd71f10cc7c183325b1f8ac9/66195030688.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134d7dd1da1d---81540187941.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d481fd5dd395e05ca10836b03526b79a/sowuseximebitolapenejedaz.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/rcte69kh9mlog6dj4mqd9gnvj2/viputopixogajexar.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/gevoneje.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/491531556d741106e546d802e2c47a8f/56691012527.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613896dfb09c5---foluxenitimolunixabu.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/xenoxaposut.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/diwexanokifu.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/kijorisisesiz.pdfIn PDF document text
    • http://landpas.pl/upload/file/wovaruniwexibapusire.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/97531328934.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141f72239e6a---32693665086.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/fapaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=funfair+ride+simulator+3+mod+apkPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/tiwimiremit.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_off0000da23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA23 17784 bytes
SHA-256: 0f8879ec7ad0165fa4e86555899d20c183a85561f8ad6c3044d6b4ba5290a140
font_01_sfnt_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 11000 bytes
SHA-256: c860bb68d2ac5a17bab828c3adde59af0675e97c7cce932203d2bca84651f60c
font_02_sfnt_off000121c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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