Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af06dd8afb2ee2c…

MALICIOUS

PDF

74.6 KB Created: 2021-09-03 01:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c18804634e654cd953a7472e21b1f39 SHA-1: 7b253d294fd03b0a6cacb5bd5f4bd1be86215340 SHA-256: 9af06dd8afb2ee2c44182ea6ffec6d89f2a8e00ea5b667a164db3072ffc4f1a2
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. The embedded URLs suggest an attempt to distribute further malicious content, likely other PDF files, under the guise of legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://naturalmis.com/userfiles/file/pepudupisexesoserutenirur.pdf In PDF document text
    • http://chamdure.com/DATA/files/wexupedejop.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/70853555993.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16109fe7f4d5c0---48350799522.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/49355162130.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/40870838447.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/29264721652.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607361b4adf7b---wemebanek.pdfIn PDF document text
    • http://seritour.com/rsm/files/zenetobub.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608569b99cb4c---waxegalemegoxazo.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/66449596833.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/dufofufabababurixitav.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9cf0698e56---felupumi.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/21718407753.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e5503e2745b---piwije.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/zajurivesekopobiri.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/gufofakax.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7dac032af---vometufumaxejezamej.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1d135c2c4a81e9da47444bcf4bfe7a0d/75441281425.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/139be1be6d6d8320dd3af0be39e06d7b/nerelubofopawipezirovobar.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/66941009544.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f84fbf2d0---punopunezufadigufupisifu.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/votupefunabafabosivopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=northstar+3+listening+and+speaking+fourth+edition+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_off0000bea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA7 11120 bytes
SHA-256: 4f25fcd4da059a899d41a7bfbcdd4350270d115d8369f34f15190375761483eb
font_01_sfnt_off0000d860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 16696 bytes
SHA-256: d6274eefae1ffe9e3be222cd9520eb2f926431cc87b05afe4a10e74d236ccf6d

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