Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5fb2eae81fe4aa…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 07:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f6fec65204ee203057c8b94bcde2a89 SHA-1: b9ab5d2de7640147f7c1f288ba65da7eccc58145 SHA-256: 8e5fb2eae81fe4aa377115212e97acab885ebcc59d7a19e41d3f7072e16ec611
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wastran.ru/uplcv?utm_term=how+do+you+change+the+writing+on+your+phone PDF link annotation
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/84949783541.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc93d9f47---lufupewe.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/3cm06v1pthsjj17ucudfv3mep3/48355644511.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/tufapumugole.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/15726661210.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/sasekibaxisofe.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136b37b6aa87---buninibuwunokikunaferimam.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/58181489877.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/9799790070.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/sanazexusegez.pdfIn PDF document text
    • http://contextuae.com/resimler/files/99915614181.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///jenodatejibav.pdfIn PDF document text
    • http://riph.pl/userfiles/file/wimex.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///99915882502.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/58baa7590f9c8538e58e6b1d86060135/14599983236.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/14471785334.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/49909800133.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/78434771089.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/26368358294.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/99260810042.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/debazotagades.pdfIn PDF document text
    • http://marymo.ru/uploads/files/zirexitizovasitopibazan.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_off0000cf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF51 19904 bytes
SHA-256: 881e008f9f4943b03a6ce52414fd3b4c35ffb71641f621a7e99cf6136a0532bf
font_01_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 10872 bytes
SHA-256: 9568bd62038606d8d7f198a14fc6d60694fc444c0ce7de303bc49e61dedffa44
font_02_sfnt_off00011b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1