Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3ebfa7c5ea1210…

MALICIOUS

PDF

76.7 KB Created: 2021-09-06 13:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97850e59b157034c70461f07b7a8aa85 SHA-1: a29687cc778a0bdbc99f3028d67aaae015bcd335 SHA-256: cf3ebfa7c5ea1210eed75ae01ffaa9e9c8d1595eab2314681d603d1770692590
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting it's used to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://schokoladenfontaene.de/idata/buzupuweregomer.pdf In PDF document text
    • http://ck-tct.ru/userfiles/file/82796985327.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bama7lph26ql37nb6tmq7nd344/68868187242.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/375ddbd2ee3f2a64d7ce8d81b69ca8ec/92052341018.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/71222671498.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/e097a2ed360b4acc8432c48bee2f151f/51839336297.pdfIn PDF document text
    • https://edusfera.pl/upload/file/99664467672.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/26b35ccf9c516f8a80fe9b7c55a54398/36662416919.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3c0794240---giwurutorujaku.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1192b01f---36008956299.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/jitujakofoxaje.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/nodegup.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/wisugozigawager.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/99173827987.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/nedesuvekunuvegiliroga.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b6462ec2c---71640132766.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/lerulijub.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/pibemubovifewodo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1324293e0c---55181699860.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0bbe0a28---bixisavi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5dbb4f0cb---40515144850.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/76148823383.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1nipuuqt3rd12kh2p0i04521pp/60868377365.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/5unnhnu79sn87gql8kjcdg02fs/sikaz.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/woxeduf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=jurnal+ginkgo+biloba+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_off0000c921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC921 10600 bytes
SHA-256: c9c510594c21b085d1c5e83b1f831f60653df8fecd3589bf3a565e6883f683a6
font_01_sfnt_off0000e0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EA 17028 bytes
SHA-256: c4877789afd1e5867516d8c5f25922a5429eed203583057ca17e5fae93b511bc
font_02_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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