Malicious PDF — malware analysis report

Static analysis result for SHA-256 acca4bb8f378d928…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 13:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e40549ab5dafb6766ccd49778616c6e7 SHA-1: ebd26f2c4a4c929265dbf9654326430d27637508 SHA-256: acca4bb8f378d928272bdd661c45320cf67e4fea41b2595f9ac3aa7a984a55d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://infrive.ru/uplcv?utm_term=brooklyn+blood+pop+roblox+id PDF link annotation
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613021e74617d---71688591214.pdfIn PDF document text
    • https://titishop.co/upload/files/25157400397.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/6978193692.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c2b22c7ee11bdee19827e41603883156/kidere.pdfIn PDF document text
    • http://premo.at/userfiles/file/mibozatezubijodixoguxil.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/49333728955.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bbfd974bb---loxalanadivolar.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/jurudakisejovowovumozogo.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/83561943286.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/88412222659.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/82508192980.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7da5bd75df2afa98f560f2f89cfd5048/bukebupuvexogegosugebitow.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bapukegipi.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/31157842064.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/madizotukugax.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/sukutazufokedofuti.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/66197305952.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/91205178855.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/difesij.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdb163ee57---3652640586.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/tululefo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/791d3cb26d30967f049e19533dc0fe7c/85600385987.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/nodowezulumipe.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/18440991718.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/3257041199.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/pozafarixigifawa.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/dasunisererelevuvenikek.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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 10328 bytes
SHA-256: 4defe15b872c0d5f754283febad3b133176a5b741359c21b0366b49d328eebdc
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 18164 bytes
SHA-256: 83eb82291d35d9f4da0900615cb30ee63cbd76a1aab9e5373f260d4fae26a8eb
font_02_sfnt_off000129ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1