Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5609f9a6a2e388…

MALICIOUS

PDF

90.0 KB Created: 2021-07-23 18:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 76d2c508f7307f3587bfd7c230f8de44 SHA-1: 92fc7e0863b90acf07c9a156d6f7fd857f0c4d28 SHA-256: df5609f9a6a2e388ab335a7fb6225d7bbc2021a54f61daf1b67cde2280ed713f
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 WordPress upload directories, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a05285ce1---89098340292.pdf In PDF document text
    • http://doubles301.jp/files/ckeditor/files/mubomufelopu.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/85674774086.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/e285bf274632b2a31a7e9b2561c5b88d/30327514030.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/23955697179.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/faxovikifamokimado.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e37e62a2665---6954005015.pdfIn PDF document text
    • https://focaccellini.it/file/lagoxerod.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ai6p2ujcntvj5gt2pcgkoleiv1/11652445758.pdfIn PDF document text
    • https://eminesenlikoglu.org/resimler/files/digosanosu.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/zukagilutexavogafuvuwu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/eff5daeb293528d8b8473a6939770a9c/52428367526.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/1m3sh77ttl4h86m676d57v82o6/vekamodugusurige.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/fofarasupiruvuvita.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/notabalarinozetejekodolef.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2c8b36aeb3a7af6dcce1cea19e87bba0/4237956827.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/34896891431.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/sibagugokifonowukusagupu.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4ae929c2f---sijigupevunexev.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/79092712230.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/jidazux.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608db9f96e791---vaverejebitebiganunaxidos.pdfIn PDF document text
    • https://aashianarealty.com/file/sovotibowusutavezaw.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/fibudedidimepefelebukowi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840e6634663---28168018503.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a09f8e5a302---10449909772.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210721_5DCE3771720CD713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+crucible+act+2+movie+study+guidePDF 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_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E6 11216 bytes
SHA-256: eec27dad741c16447123068816735b0eb9a243301a3812d95a59ac130ac49bc9
font_02_sfnt_off00012b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B08 17840 bytes
SHA-256: 03db07dd0805dd970813bba72537365d13c60b2dd8defd9a9b13f5222c177145