Malicious PDF — malware analysis report

Static analysis result for SHA-256 249989846c2c50fb…

MALICIOUS

PDF

86.0 KB Created: 2021-07-23 06:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e990f2c40f6c9c788f46fadd2227e279 SHA-1: 2a0257ff03e1087c806eca927ffd80ecbe3ce4b0 SHA-256: 249989846c2c50fb0bda5cd3ee4ad9825f3450cceff67f6f2e43bd4345cfbec8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pet-fashion.ro/mm/file/simaxofuxanozi.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d3f602fc0---gexijimelebamesarej.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/ninabebatoziganapafipimom.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/revovavaroretumuj.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/53457818434.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c43343a92d0---53243111497.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/68669768201.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160aad634de7f6---kogobupanif.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/97055765213.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/merazodolazofipupo.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/14/71375647922.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/bakuviwijikonusuxanobopet.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/21b1762464603a751bb011c1862dce18/vurotiwelixewi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/nitid.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a0eca3248---12730151811.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5dbc036e---lanezisimezudijowuzo.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/nect7pc1q0qekjkdg4999td883/20183669437.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/gigasixasorigagazer.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/vupunufegozinane.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/joganejesuzifodibo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/c6e6ims775q7b2l7ogia877og0/zujuwumikafawuv.pdfIn PDF document text
    • http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/35092700073.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc6dd963f3---93426944235.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xotadupodobovatuxugif.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///45931779654.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44dc412eff---kuwepaporudopipeto.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/nugebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+my+cat+to+sit+on+my+lapPDF 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_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 10808 bytes
SHA-256: 6da83e2bd380d45ca84f60a53223ee98d611c065b17644a2203c2764828b81cb
font_01_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB2 16704 bytes
SHA-256: 98b8f90b688acb74a66ddf910839d4385ca6e1ef5a18024c0d16c518fd3e1628