Malicious PDF — malware analysis report

Static analysis result for SHA-256 f485b52e689a1f44…

MALICIOUS

PDF

73.7 KB Created: 2021-06-20 21:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dff2483ac2adbc03e9743da3fd200462 SHA-1: 3ff4997350dd633052e9a0231c36f353e6c3f8a7 SHA-256: f485b52e689a1f44fcd48730303925762e8bc0be27ebaea93cf94304894c3647
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to PDF creation and potentially deceptive content, reinforcing the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=formato+acta+constitutiva+de+una+empresa+pdf
    • http://yongqingtech.com/d/files/25982197829.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7306ca22cc---ralofopusutadapa.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b425bbca978---dafajolisigajakedu.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/nnouk8lih5ducqfpf4vl15o4v7/pitusukaxata.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b15d5b698c7---31766632128.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609506f9a7518---10884520525.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/d36notse1ascu8dn47363hg1eh/5892194185.pdf
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/zozameja.pdf
    • http://ranaghatpchsschool.org/userfiles/file/37305727664.pdf
    • https://appvid.eus/userfiles/files/979701414.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f85445a66c---6673589908.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/lfm85g3fhfsbu4ks9d7creoptf/dapokex.pdf
    • http://kiavysocina.cz/UserFiles/File/zevopi.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608321c7eb300---kutorajewegomexazakewage.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609324645a7ff---muwarulotojosez.pdf
    • https://airflow-skateboards.com/upload/file/fotuzasojajat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0db.bin
da6f0a4f2d051166f1657ea3e263c48500054a32e6c15f2f94f60ff8b9a931c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 5284 bytes
font_01_sfnt_off0000f2c5.bin
a95df66508da8c675e31e1918cd10450645ad4fc1e59fdf80f0a1ced752072e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 11484 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.