Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e5aac7e89d9aec…

MALICIOUS

PDF

88.6 KB Created: 2021-07-30 07:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 46878887c6e69c4e941cf2f50be28d5b SHA-1: a58990871bda515a82b7ff80557130afa0710e02 SHA-256: f5e5aac7e89d9aecaf6a295e16e5316fbf9c03de7f58103ca3f8f0ada8323ecb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites hosting PDF files. These embedded links suggest a phishing or malware distribution scheme, likely leveraging social engineering to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c692425c13---bibefesekemiwolevobidoni.pdf In PDF document text
    • http://csc0311.com/userfiles/file/20210715200226_oda74f.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5076fdc0c1d018753558e3a8d05f3afc/medir.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/puxonibutoxaxeliworugodaf.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/fagasisagurolugilivilozu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160806b9f5f58a---24066735411.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d9d94d35e---90744690912.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/basifikofajubifogu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cf240644c---dojobemag.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/r13scmh9ucqujuf6epvuioqni1/6261524216.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/jvqnl64biv4md2ar5p60qde42v/nakemebunipowoji.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b5255f922---21820028025.pdfIn PDF document text
    • http://jp-cable.com/d/files/61189096935.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079179107f0f---jivisolipepukofet.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/49799878736.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/phbbgcegrdlkblda7nuoo3a9ff/melefajunojifawikudakufib.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/d7a7b12919a228fd766294f3ce5ac901/83795105425.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57ff130b2---89654323293.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/mabagesotesigugem.pdfIn PDF document text
    • http://zgic.ru/!upload/files/vibupasumawavusoxulosubab.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607140f1d25b7---kulufujaroj.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608188712e09b---tedijexeguvumedupikudi.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763b3b52719---liraniburidupuninokireb.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/qimom813p0gp899bmsvac7l5u5/96679239865.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/13762341081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=kendriya+vidyalaya+online+admission+date+2020-21+for+class+1PDF 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_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 11136 bytes
SHA-256: 29931e3aab0a89d2f352fa92ad69135c410031ecf2c86a7cc4393c1375c35a6c
font_01_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 17240 bytes
SHA-256: 59e075472cdd3dd844bea94452d74028500596ccc17ae29ed47df0e27dd018f1
font_02_sfnt_off00013b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1