Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbdb039edf6be93…

MALICIOUS

PDF

93.1 KB Created: 2021-09-07 14:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c94a90fc2841fb6a6511ea1cf5bea56 SHA-1: e41811284e40ec636b2bdda569d4aa275231d657 SHA-256: 5fbdb039edf6be933f499b4417903229863dc9c4ad065b129d7c8bbdfb08364f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=mecanismo+de+accion+de+los+anticonceptivos+orales+combinados+pdf PDF link annotation
    • http://textingrights.com/userfiles/files/bitob.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/ramuwax.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4fde21841---jejiwewemupekezakutepev.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/tasewoziludomuv.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/siletevapadozizigunemuda.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02f84cdb8---96095130627.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/28444414800.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16121de5d55264---tuwugetesetolenar.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783d4dd6d95---87978692307.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607816334773d---refokij.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/71026641746.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/90439018591.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b46077d70a---94429560385.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/24c239a13084c5fbca33dd7a64dd1e68/47263636166.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610d14c664308---31541258981.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a7d36ac6---vebeva.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/29928846807.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/vigigixudenejes.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/wixubojewurumijanopume.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/venugododo.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/dadni0c90k9ein2do3rr6j0cq4/wipitozulat.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/91337581117.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/3641899205.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/77098136968.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/doserupap.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_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 10980 bytes
SHA-256: 9515aaebbf3f030be71067ec812ec7819298da6871b1cb819270cacd3d47c62b
font_01_sfnt_off0001197c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001318e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318E 20224 bytes
SHA-256: ec8a321c5a5550e41a23997b34eaf94738a62ae4ec894b3f5cddb5996004466d

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