Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78b3db1180c59f9…

MALICIOUS

PDF

91.5 KB Created: 2021-09-07 08:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 04f76c28c575cd92ac735a7af16664c2 SHA-1: 36aa91e7391ff1b5466703c36a173bb23e829bce SHA-256: b78b3db1180c59f95ced39430a4f0ebbb71fd5983ef201d187bf839661d30b04
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links. The document's structure and embedded URLs suggest it's designed to lure users into clicking through to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://a2designbg.com/userfiles/file/92862158395.pdf In PDF document text
    • http://lycee-elm.org/userfiles/file/24654207058.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/p379i20r678s7atjl2a26dmul4/towafowijevegalapulonisok.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f79f74adf42d03f0ff1f92d34a7b3043/6331672148.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b11c07d79c3be65fe75fa0e42fc43377/33291658298.pdfIn PDF document text
    • http://atek-ent.com/upload/file/10778835979.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/vezikefi.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/49217914318.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429041846800464.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/7078604445.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/nutadonunoti.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/8265221817.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/66499363544.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078437e66160---13445115167.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/gifajupemisup.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160851a7c11cfc---21880786245.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/9231327862.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2383bd59f31a51cf1a3bfea6bf660b48/33357189249.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/34709465324.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buginak.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/71485295149.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/boguj.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/28911997995.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073666377759---wotulirolonowuxenowofameb.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/56976165551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=social+media+trends+2019+pdfPDF 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_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 17108 bytes
SHA-256: 995833a5feeb6ddd649c8d5afb63de0816c3df81c96ca3d8761973528ab004b4
font_01_sfnt_off00012d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8C 11316 bytes
SHA-256: 3885e77fd9d2952d9a4e8f7a1679dcf609c749df1ff26b756e628dc3b11036be
font_02_sfnt_off00014827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1