Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28268c67d71e371…

MALICIOUS

PDF

124.5 KB Created: 2021-06-20 20:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4ddaa02997ccafa79d2f8f16b8a28b05 SHA-1: f32597f93d51fefcefdfb1df966136344abd0b89 SHA-256: e28268c67d71e3712ef470f5da440135bf9175a79fb7445ebb75873089e9ed25
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to direct users to potentially malicious content. The presence of these link farms suggests an attempt to obscure the true destination or to leverage SEO poisoning for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/1ui5sicbuca0s13595squvqbn2/34741089242.pdf In PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/df50b376ea1e97e5704f42d4cadbaf90/9919048511.pdfIn PDF document text
    • https://coil.hk/upload/files/xorabodeg.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/52139bff75f62c0d88a602b8c632ab05/81110133466.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/jerazikemituge.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/39931110131.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/nolufen.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdca255926---lifotinebujut.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/115eee3935db0242180f29046770ce4b/nidedoruxajolowep.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/mixepe.pdfIn PDF document text
    • http://recrute.fr/files/files/55357715951.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3gjh9sc9ckpaek81ifqb9sc7q7/75189629006.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/329646365a93f4e164b22fa149f84967/bezeviraxufapawek.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/4ff548b589544f571d49589bd0b29d58/zadelozivinajawukoruza.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077518e989ac---baratesonep.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/77703702424.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/11374108725.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=scavenger+hunt+wolf+schoolPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CE9 5232 bytes
SHA-256: 0c5ef11582f08cf2969746e2657985cbd9804792c29147c676d93b812132173d
font_01_sfnt_off0001aec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEC1 11320 bytes
SHA-256: ef708e368997e58042ee75d2fb100f84014787bdc1b8adb4252c755eab8e36e5
font_02_sfnt_off0001d518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D518 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333