Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19da738e7732781…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 22:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4a005e6055906bf5750c4190aaa3eca SHA-1: 80cf79a22f6031bc97ff07f6fb8658a53a07fc0c SHA-256: a19da738e773278138a7ad12a012b3f6f1a9fcb78cde24578cefe17fcf6dee53
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 compromised WordPress sites, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://bahtiyardishekimi.com/fckfiles/file/vigekitefolafez.pdf In PDF document text
    • http://erfansari.ir/ckeditor/files/files/17706350335.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/zagegetujisabepunesesimiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233ed07c8e5---sibamuzixajanozigusatoxu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/da6f8a65265152bea46387474772cfb0/jodoza.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/31405577093.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/foxatozeboxaropofiriwepu.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/tut718u89c3av0fgnenepls35u/64616329340.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/33921644169.pdfIn PDF document text
    • http://4darchitecture.org/img/all/79150338053.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609630a7aad57---kosonemogetabetopolunari.pdfIn PDF document text
    • https://alutat.com/data/file/poparegemolop.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/tepikilumuka.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/1372394606.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc178bb42b---rapunelebukorivarovet.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b328b12918fca5119ddefa1cccac995d/vukabajuzifu.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/xonopegavomikupawara.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/beponibefejaparamenevene.pdfIn PDF document text
    • http://strandedtattoo.info/file/gupuzusigen.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/4vgv4kmr01g931639sd5cn518l/7924810933.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7c112c50---kodovuwaditejofezozoxe.pdfIn PDF document text
    • http://jwnorthclassof70reunion.com/clients/c/c6/c6167e942b76adab5863fbee8ae727a7/File/nowusiloxezipitizara.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fa850861a---68628475757.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/89767082448.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/3f1cf1a5adc4e42e44db9ff61f5ca09e/dowenixipudelagewevetago.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/mubuxosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=intel+ia-32+manualPDF 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_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 10260 bytes
SHA-256: d82e49a6de59775d4ac41c9a717ad1802f5ff6100d1f0c8aeb1105564b0cbc6f
font_01_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 18476 bytes
SHA-256: 3a52ae7cec1de81fcc50372c4280ec147dd78b6db679bddcc6c7ec6c24599f77
font_02_sfnt_off00012b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1