Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d95ae6673a1bcb…

MALICIOUS

PDF

83.3 KB Created: 2021-07-04 19:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b335dc6fcbf2f94de4bd09255c11be9e SHA-1: 23e8ab979273022a1fff7853e43c6c3c6af8e7bf SHA-256: 66d95ae6673a1bcb9b5fc643e51237ca59404264b6decf4b045e2b9169127170
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage, likely to facilitate the download of a secondary payload. The presence of multiple unknown URLs hosted on compromised WordPress sites reinforces this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfdb1f0859---zovibowola.pdf In PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/16687241602.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7a013f7bfdd0a49c2d650159410e1974/gopegalisajufipuwudasozup.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090a0be12f04---lelav.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/54401bd4bfe258318b0828bc5eaaf1bd/71944031977.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a52d977683b---pafuseminoropevikesaj.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/23591490996.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/zorasenulozejoviviwimuwer.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8efdf4b44c---tugapuxexilotirob.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/65523047161.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079479bb24a3---kinukagis.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/movororisizebogudelujajam.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6533ef76b7c2a87f90bec14e187c6dbb/siwuxanifuz.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3259c83b6---88449485408.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075088f9f93a---kunexeladatujirija.pdfIn PDF document text
    • https://flomogroup.com/upload/files/jutopewilerovapesenoj.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/donukafapotilasuseg.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/85691988787.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/roxumilupa.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/8iruf9lj2ka64mvkjehfrl3462/19739206185.pdfIn PDF document text
    • http://mebco.ru/images/file/zejosuvofor.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609006ad88b38---barekudapitireredi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=polycet+date+2020PDF 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_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 16852 bytes
SHA-256: 687a5765d7b1a5146bdd129c3fcf4727d2bf947ca6074b477bd362a3e7f5a947
font_01_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B6 10256 bytes
SHA-256: 436b0a798686d4f64799c6ef464fc108d8a518296b422d51202e5e71a532d568

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