Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01eb3e307878e80…

MALICIOUS

PDF

106.5 KB Created: 2021-07-01 15:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 792f9f8c9c4aa333b495262dc95f29b2 SHA-1: c117e93d70c93d133eb0ae5f82ea9528173a3a2e SHA-256: c01eb3e307878e806772ccb5fe2387f612d315a7b38e17c6d032809a28ebeba6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, which in turn host more PDF files. This suggests a multi-stage attack, likely for phishing or malware distribution, leveraging compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9c4b117590db9d3aa33b70aa0c11e1f5/posaduzovegaveleses.pdf In PDF document text
    • http://sosnovgeo.ru/userfiles/file/49251643911.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a61288dd5---79249010372.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/t1b7qeq794v9te4qaja7e5htop/51342591714.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/bufujurofiwitipuvub.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2ba86e271---mavikunopabab.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/jofapewe.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e1515a7f3---biniza.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/40685294526.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/1b890926d74b1ee309ff91ed2a70f107/14987774858.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ild72pnogk1f1ud41l9hr9dqjd/86755306063.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e43171c38---bemumipigareril.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607029d22da23---xopixunipafa.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e27928f12---4998516632.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d9140798593447f30332fdd535dc1f60/tukixuwa.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/djvkuof0nsr7lvq7nqppejdt2e/21275095823.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/lovifimerad.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/76476107556.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/begefikakivilenawid.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/pogewefetetulajifabu.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/241i547ah06iea4s764p7rk3li/96994765125.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/dowizalabufubusidipidir.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/nabazuwavor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=high+road+full+movie+freePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3c370c1a9ca4ba200f2de8a0873aaf9c/gexosopubutegurew.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_off00013e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E59 17748 bytes
SHA-256: 90bb1c22f9ac20b8c066745036500443b978b9b7b4699e3503de488fddbe6b5c
font_01_sfnt_off00016cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000184d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184D3 10588 bytes
SHA-256: 9f37bb119b55d2a039279fe37fa68efdc22564a1b94d86ffee4f303566ae8227

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