Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbaed83ebd39eea7…

MALICIOUS

PDF

90.7 KB Created: 2021-07-07 21:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4b3e39041f11e68265dc0517d1654555 SHA-1: d13fd29581f46a183a60f5e6b6e71d49b8379836 SHA-256: cbaed83ebd39eea795dc2663aa85f319e20756c21763deb7f6580d6695bb5d7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=tamil+hollywood+movie+download+2019+isaimini PDF link annotation
    • http://glenbardwest1965.com/clients/0/00/000b938fadf99fc3242526d4297efebf/File/dajafinitiwilu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b040a78c92a9f9b0e7641f8cf86439f1/94099376759.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/jalubasem.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/temizoketomog.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qp5g271i2q527g2kgogsh55ja4/68516198547.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/mqaf65nq4kvdamrdlod1g4g7p2/fakekafedarepa.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/stun3mnedbqj2f9343c03n43ev/xisujurunozifazokuwop.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e9c2e13fe---19973431426.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/somexanugexajedidunom.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/zununagi.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/f221a124b257831e7f59ba6c150a9b94/25851559075.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7940bce204---bamiwiradotazidegewi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6a1c3ac5df13b6b855e894081be727e5/buvojugexixuvuve.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/64822aa48cd53b55ee43532119064cb8/63896596783.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b27e274fd3beb913fd4ab02564a566a7/72550529932.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ef405cf8f8---70422090478.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/83f36278cb7d51b5d2d024462d6fef85/22145204840.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607859012947e---somutupu.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/voribuvilizosawajumarexis.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/podofisezapotekenoxukodud.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/57331748435.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/lofafitadunep.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/29alfqjuigcqu4i8nvb0qc7205/74741378279.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ba6ffca9f3b1a087d92c24cfae900572/28062471058.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_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 11008 bytes
SHA-256: b9c19667a438b9020075d32e685d165040d31f6c5dc430b83a7a012bce4cdc66
font_01_sfnt_off000116a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 17740 bytes
SHA-256: 69856c8aac4766a0e4a08ab3aedd879e352f37ad7919dc83932144ad1610d697
font_02_sfnt_off00014543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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