Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7950f34ac6bc1f…

MALICIOUS

PDF

91.1 KB Created: 2021-09-01 21:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56fcb3dfead0ee1f1008d4515eb9ea2b SHA-1: 8d7c316419d99a392351aabd1cdc6b1d3c07bfd8 SHA-256: 8b7950f34ac6bc1f44f26f7b7557192fe0cedde03a94d30b178a88e6e251f50f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress upload directories. This suggests the PDF is designed to act as a link farm, potentially leading users to phishing sites or further malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://vegas-shop.net/uploads/files/70264436884.pdf In PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/dumolafiwugakex.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/eac82ad29b87c8690f37400d59dd69a0/14252527842.pdfIn PDF document text
    • http://henca.com/files/details/file/48718265889.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/xasilumomomoz.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3964e4d11---72005311192.pdfIn PDF document text
    • https://aksusu.com/upload/files/pudaxepuv.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/kexorixoxerufe.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/14bdd759d3889cc9816af9bd0bbe8151/fifiso.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0183e19f886b982e3bf46007659d091f/pewuvuwobovobopiduvus.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/bukorari.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/bozubewev.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/baxaretozorinexak.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/tujurilitojubilajuvalum.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/86691491141.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/6264b65a436ad595511b88722f698325/51984321141.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/97331112150.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/mezopujabedela.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1452b7d06d---95068890660.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/vewibogonikiv.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/19708159606.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/45368004434.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/tivegumuvikulumodoz.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/19185164391.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/59146359909.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ae02c6ac59d3006e8f6c9bd22d0fc7bd/wivaginepavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sultanate+of+gowaPDF 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_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 18236 bytes
SHA-256: 019a2013809d19763f8e9e46d61706c10b5e53c3294fdd26cdb0910553b66e11
font_01_sfnt_off00012f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001477f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477F 10288 bytes
SHA-256: 2b71f976c1009a64e1d782c325aaeeefaee22a2a3c838b5cfcc0793e165b6336

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