Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9313b9c99eee822…

MALICIOUS

PDF

91.4 KB Created: 2021-10-14 08:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43dd29eaa540f5dafc8b6250ad3d63e0 SHA-1: ea3ea44a2258cca4bd95d2b77d4417462b6bb11c SHA-256: f9313b9c99eee82262e4c51894ca825da2235da21208ef9518871e128d72283d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://drafthe.ru/uplcv?utm_term=difference+between+did+and+mpd PDF link annotation
    • https://togelunited4d.com/contents/files/46397591497.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/xukuno.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/68558094180.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/bufefakerejatujulefoso.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/17c73bffbfbfa6281e033d1f1f964a1e/84461468187.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/wukeme.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/dupubejimarokox.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/37269307572.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/wegewenovetidufefuvegepew.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/tigepabozipi.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/zomuruzegapopitusona.pdfIn PDF document text
    • http://shamayachts.com/upload/file/vakex.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/suxipikakujigepafukut.pdfIn PDF document text
    • http://www.moyekolodin.com/files/9370592577.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/nisuxuzi.pdfIn PDF document text
    • http://terrietanaka.com/library/files/78872257288.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/36896029379.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/33374729250.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/vesaxubalate.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a08c3f453ca770ca4d21f585056b3b4b/kefoxixukulomowapemetaf.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161565e487c778---90822500418.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/jexatawunadi.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/verimetidibodegenazitisar.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_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 20428 bytes
SHA-256: e95f294361178902e05b91d71f89e40428befaa48396d11a24ac78cfb99974fc
font_02_sfnt_off0001477b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477B 10676 bytes
SHA-256: ccc7df1d05d47d10dff366aee49194540459524552548b7625a9ed21733d471e