Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddb87e9d2a725da…

MALICIOUS

PDF

88.0 KB Created: 2021-09-06 06:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a7bd2889b0c665de2e4ad6dde60a0e6 SHA-1: 0616e1814d0851212e95ee7b1b2d5ec232bdce35 SHA-256: 7ddb87e9d2a725da2dab7790d4693f4415a0c1b75a03703e594b671a8e007a52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous URLs and the overall detection profile point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=monte+carlo+simulation+in+excel+pdf PDF link annotation
    • http://stark-tools.ru/images/uploaded/31281368551.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/80637057578.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/23668417992.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/cce9e40ff24e2114c54ceb2de075b11a/pebesafobipuputazek.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/vuniginuputixa.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/78126414323.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/89qsjvghlh3flfuq919sudasit/nozenut.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cafe9a9d9---vexowumisuxusinuzurevata.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6c822d99a---50268859175.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/15383372105.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1e777f04f---wegudad.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/pevoberunorudejo.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/22364517238.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/fsh6baabqe8igj2djgt40sanq8/fetajug.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/limadiranusogezeragejibiv.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992c9f48064---galaxaxasedufabanofofiwo.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b7760ba0a---dilegalariwijosajuvujip.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/fomefijuvomopix.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/264c18b3ee0076313c9cfc00b5122d63/xefoguvifix.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/6b2338848c4149fd640c2dc7415b3ee3/rokikesetibezivelupatuw.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/povifezumosuguk.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/71657322557.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/ziwejomopixozavel.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/58a8f36eb1b640b2e44dd084b192b1d9/96734641862.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072651c8d599---wolipakile.pdfIn PDF document text
    • 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_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 10976 bytes
SHA-256: f7cdd20a4516a9cbd972e744ffa354d1dd6e3b08f47d8f12de82e8e027f46500
font_01_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 18752 bytes
SHA-256: bb2a5c01c71f8e3fe53616f743cb3ea6f249baa2b16f9439768e3e0eaf850f74

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