Malicious PDF — malware analysis report

Static analysis result for SHA-256 327e5876f7f57f6b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 14:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b587761da28aaf5437a803aafe29eba0 SHA-1: ceb671527d32ebf3b97c7e935747877f55cbe209 SHA-256: 327e5876f7f57f6bb3f02bfaef96e8e00752d8febcfc2a39bc052568827629e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nomylo.ru/uplcv?utm_term=prime+os+pubg+mobile PDF link annotation
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9c1b8218---54258826222.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/75107902388.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/46526787876.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/68367068707.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e5956c758992d3fe578c6a94f8b7f746/50509521025.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/19478696941.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2c625099c---59605311946.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/nimulosuwekorivojoveso.pdfIn PDF document text
    • http://lgassociates.in/uploads/matemexadunukoximexo.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff8317460---bovepuja.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/lupawefijenenokinonuvu.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/datezusuramu.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/60666422511.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/67ac6a86f19018373eee973145460668/25324218607.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/kunuwebixizanene.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/fulapujugesumateranage.pdfIn PDF document text
    • http://falerisztika.hu/tmp/wuvagogano.pdfIn PDF document text
    • https://ycb.one/pro_pic/files/47515528322.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/cb3089cd112b2f174e2b8f65af026ab8/dogeboli.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/35733319747.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/foh6b31li6e12ifcnd44a0060j/83491457702.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/rogogifudolaganafeg.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/5740049501.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614619d95f26c---16912898023.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/47193532425.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091417114569.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_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 10472 bytes
SHA-256: 3264216a539df4c9799a1eb7ec69e38c9546fcb8704a0b489b2084377dad7e08
font_01_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 16868 bytes
SHA-256: d054f586fcb5928cda77cee9d0cd567555c5f9217616f57ca43a4120d3df745e

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