Malicious PDF — malware analysis report

Static analysis result for SHA-256 752a3aec55bf8152…

MALICIOUS

PDF

91.4 KB Created: 2021-06-26 06:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 362e90b769b8a5ab774f5da03f6d39f5 SHA-1: 1516ec985f2517fa3bced5116d649e3b37514117 SHA-256: 752a3aec55bf815245864f66484d734fea1305a31bb0b91046f13b0ea9473bd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous distinct hosts, many of which are compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://hasici-pristroje-eshop.cz/files/file/dujizirebavowe.pdf In PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/c21f7fc3ea2cfe964335cbbccbb89e8e/43877630918.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/92481179090.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/sugokagowosatovedopedu.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/37274870330.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/asl6or5mu07k5njcdd5i0qjg8v/dunivomutonotibo.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609735a6e23ce---zojimokados.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4c4199839---zugesexewudujubijowemis.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/1p732sqvm216bt4qvrp42gs5ra/suvozur.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16099f84f70213---jawexamefulox.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/jibukolix.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/zujuzo.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/woganaxibojovumexob.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c3d0487dfa068ec8d5d17726e393305b/xaxepeburo.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607547ca34b15---nobozitunoxavez.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/taxoxuvodi.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/35778104332.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b895865c---lajaso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8cbe11186---72559931541.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75e249acb---xamanozosonuvogala.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/fufofopudisoz.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/g789jhijmmr1180eeiq9eq0buc/13453228253.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/48905bdd94850bdf75ec830631a60cb9/81883641910.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c7aaaa147c---fijuki.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac29f7c10ee---25411022752.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c4d75f84f0ac17623f105b9e53585cdc/xegomodanunutorajuvibe.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/keboma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+excel+sheet+for+monthly+expensesPDF 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_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 17288 bytes
SHA-256: a5c2b8fe3e98bfd1098ebbbd4e398363c400e33272a841651ee918b4e23e2f96
font_01_sfnt_off00012f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F04 10760 bytes
SHA-256: 47571aab6cc416543dc4491c6f56d47bf0ece50207ff50d44edf3dba82d4bd51
font_02_sfnt_off000147b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1