Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3475123c4bf530c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 08:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5fa9ce6d2185544a3c06c57075d44ba7 SHA-1: 761ab417110874d3d19c40d96a0e56a8fc437bce SHA-256: b3475123c4bf530c1fd474f8313f1a948ff9f692fedf28216c8871fc7d945e6d
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, pointing to multiple domains, some of which are hosted on compromised CMS uploads. The presence of numerous external URIs suggests the PDF's primary purpose is to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://misbahelmudii.org/ckfinder/userfiles/files/bolewokaseta.pdf In PDF document text
    • http://mecaniquekd.ca/upload/file/tipavakofutemozowirafe.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/buxenevikatige.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/94879744761.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/75735484.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/fazixefijasudekuzofik.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/genosuk.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a142d967588---47222039130.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b54683fa---puwaluvamedu.pdfIn PDF document text
    • https://orangerun.re/photo/files/wexisixa.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/lafuwipabud.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/fozogezuxofexijuze.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec96a304d3b---15291426109.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/nk9413gsn73a5m8qopusqhacgo/jumoworejarariduvadu.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/3nbam56pcjk9ioltb7qbndr7g2/33570935313.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3c654e94---73105034211.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b11df38df---kokoza.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/111f0168e3c9d6390c82abe27a209985/49562684447.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae85a6b3789---womawaf.pdfIn PDF document text
    • https://csn-alliance.com/data/files/93888265025.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/aed92ec901e5276b50145371b4c54f69/35340296912.pdfIn PDF document text
    • http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/rozepafepewanugapu.pdfIn PDF document text
    • https://kar360.com/resimler/files/talagif.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210613_182410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=medidas+antropometricas+de+la+poblacion+latinoamericana+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_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 19520 bytes
SHA-256: 009b6288fa465204e4bc8f8896a0437deebe0f831c859612e07717d4dbaf763e
font_01_sfnt_off000107d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 10916 bytes
SHA-256: 9b78d327b230bde33d1288fb51f611cf450b98bbdaaa5e780a32aae241c50f6d
font_02_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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