Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4a7e8976a556e0…

MALICIOUS

PDF

82.6 KB Created: 2021-08-21 10:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f1a208b59505e5920ebd626163d0293 SHA-1: 2555345112400cc5bdaee34a6b03387ddb378757 SHA-256: 1f4a7e8976a556e06c2b27f3154924e4c417837d17020259499319cf0b010011
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised WordPress upload storage locations and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The PDF structure and embedded URLs strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa9c0e9a2---86020467488.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be2b56f1f3---70786335289.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/xetigagulemosor.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/41606085821.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/81ec3e0b7aa0a1e54dd81a8c8d146eac/bomufivasinefumatajepor.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3ae6c18d4---ropavesupujarilomatunar.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/24672345019.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75fc4f22d---61894521427.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/nasezufapepeponu.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/26083565076.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jtp5gc6mnd05v3be16q37o7rkv/45225937877.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611d5e3ead8a4---86432329979.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/rixip.pdfIn PDF document text
    • http://atek-ent.com/upload/file/tozoruzogerojawepat.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/98697585996.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/18572677469.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/25832682348.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7781f258f6---33997622857.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/949b6042ba11da636caebf7dcff44a2e/60376902179.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16076e44f01523---limujetan.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/95521373103.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e424e013861f309ea8ed9aad72bb9dbd/jalabukivisajasij.pdfIn PDF document text
    • https://qnzar.com/files/femoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+know+what+size+inner+tube+to+getPDF 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_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 18664 bytes
SHA-256: 952c9cdaacf6e750fdda5cca37daa9df097fbd66c32c752db744c4b95245b28c
font_01_sfnt_off00010bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC6 10812 bytes
SHA-256: e351955c64c16b34c776d1776060550aac94319eff45e08a45a8c30c0e24a5b3
font_02_sfnt_off000124be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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