Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cbe482426d80d7…

MALICIOUS

PDF

93.5 KB Created: 2021-09-05 10:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77e9ba854bb8de140539ca24cc88511e SHA-1: 4a501a9becfb6183887a3977985ba5fa7dbee3cf SHA-256: 78cbe482426d80d7c31c976c6613ccecd1af9a469cadeaaec7d3a09faace2556
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=ultra+secreto+pdf PDF link annotation
    • http://alemotta.com/resources/original/file/penizir.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/c7qpmj4q2p0d94gl5750lqqcgv/78307694367.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/25851839227.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/19281255618.pdfIn PDF document text
    • https://bselink.com/userfiles/file/68444223264.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5d4e9ce5215b1862d0fb58f0fd541e10/lafasi.pdfIn PDF document text
    • https://jin-ji.com/upload/files/vexibinikukusus.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/lotumusikibifilenababuni.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/tuxufetofalezupivopekomi.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/wolixonajupojud.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/rezolosodebo.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/34153609004.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/41773180964.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607463a16ba6b---nuxuz.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/78555603810.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3d0afa9804f5bf26aee79555ba003e18/dakodebovunisora.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073857ed1e83---43283539149.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/18970151077.pdfIn PDF document text
    • http://beateromer.com/bilder/file/roxudude.pdfIn PDF document text
    • http://biosite.ru/images/news/file/nozabovere.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2f2423135058f85ccd07b0b0095f588e/56752308630.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/rivavemepajetesoguxodefat.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/32767697907.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77fae3645---vimusorarubewozelaxibuma.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_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 18332 bytes
SHA-256: dc28d703d5e841ec6086ef8ae446f8210bac09fd93ac7fefd295134ddbe970a6
font_01_sfnt_off0001387c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387C 10424 bytes
SHA-256: 2eb938e0c571165147ef19ebfbef3e69388a6863f7d91ed5f6989c5d2cbc95e1
font_02_sfnt_off00015044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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