Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcae7d43dd5cd82…

MALICIOUS

PDF

71.9 KB Created: 2021-09-05 22:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fa633859577c68a64f15470e80b47991 SHA-1: 11432ccd5b80a10aac2ce729b44cb2e9bcffb465 SHA-256: ffcae7d43dd5cd8293fb0a5276a284adb83a8881cdbb4206fbfae3c9a69a4074
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories. Heuristics indicate this is a link farm, likely intended to host or redirect to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/43993cb3b073faeaf53d25a9fbf6661d/xasapetegexojoponelusek.pdf In PDF document text
    • http://euredit-editions.com/userfiles/file/43329437988.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0b6dd2dbe26667d7b11e6f2867503cdd/tadeworekazokuwi.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/mirirogorifagen.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c5ac5558b---zudotosunu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/31455576021.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/gidelo.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/66084203715.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/4616368546.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/43584902537.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/kavisus.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/80750196550.pdfIn PDF document text
    • http://unsersohn.ch/images/file/xikijuwun.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/28637140859.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613178092620d---kisuvolezebafap.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/lofojukagafil.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/68893150663.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/43519800324.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/feveja.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/32750792471.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/kikebiwukoba.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a028f88c98---wozojaju.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c49f6564793---85866884826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=algebra+1+properties+worksheetPDF 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_off0000b83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83E 10780 bytes
SHA-256: 9ebe552966bdb25d6fdaef572f2df63a6cbe11d7f71c0909f52fee80e1d87225
font_01_sfnt_off0000d121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 16352 bytes
SHA-256: 99c3fa4648706b183a223d56a3c7a698a572352db4bbfceff820ca630bc04650

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