Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fae4fe23f668ed2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 22:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eadaa38d78f717162a7d322b979d07a3 SHA-1: 163360c44528be7f77d76f95e76f55f26027e260 SHA-256: 0fae4fe23f668ed292e0240539e02af7993745949c58849692da172dceade830
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://envida-nieuws.nl/bsb_website/upload_fck/file/wokizopefevarudo.pdf In PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/7qco0ud1afjob2609mdad08m41/sajinutepuroxirenupejuduk.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/fe2n5vbq2kfl586m8stckemp5r/22558885597.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/84da8c40e5b4f95c54ad7339f7f49aca/pakigakuvuravizokuguvim.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/23162260141.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a467f9c2021a6a9c80c9906d87995543/95178350911.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fcd2c3277---zemusizegolafujaporijovin.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607224ba6e8fe---22854274584.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/57c0d1ac1ed522f43b7f6270bc268702/furuxuresabuso.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/mawifukudonumepavavub.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/13172912305.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/98489898300.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/4b34c8ea6281119de6a89eb8df3aadc1/jarib.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/bikanepoguson.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/12753504161.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/5327201024.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e31f58901---11269382528.pdfIn PDF document text
    • https://avvocatoboretti.it/file/teminulalimesizij.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/30329594477.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c92884d226ac824a4c658526112a9e5e/vixawekeposefipoxi.pdfIn PDF document text
    • https://ottopianos.nl/files/koxokopaxupitazil.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/98454675400.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/79790907526.pdfIn PDF document text
    • http://hijoin.hu/editor_up/tepomopevis.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/29134495798.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/39657120765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=separation+process+engineering+3rd+pdfPDF 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_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 10996 bytes
SHA-256: 73f756a8466c2a2f45eeadfe451707569bdb61838d0fb8f4eafde7a90eaad2dc
font_02_sfnt_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 16460 bytes
SHA-256: 24937ec46ff46e0466a5f00c3a15aa4a4b785a49cd1fa83543b2b917ff977f48

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