Malicious PDF — malware analysis report

Static analysis result for SHA-256 5710b9a1c23c814c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 15:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5e87c183ee445d42d854a5af3a8dc02 SHA-1: 4690bd787126589e8ae210a9645f76199da365c3 SHA-256: 5710b9a1c23c814c4e7affd5854116a5ab4b0a2fab7b478b38cc005aab548193
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Several heuristics indicate the presence of a link farm hosted on compromised WordPress sites, suggesting the PDF is used to redirect users to malicious or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161350cb396253---62073382887.pdf In PDF document text
    • http://jandenzobv.com/image_uploads/file/49451742540.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/nunaburatebewe.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/rumikudalijovepafe.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/fikexemijadaxip.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/malode.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161348a09683f4---68650622238.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346823bcf15---74457060512.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/gositubidege.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/70098144233.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133347d60baa---79950547825.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/97258513132.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cfa33c34d---dewemiwa.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/70105781005.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/wojudefarejomozimusijewa.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/pobukozarujerov.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/12880989446.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/27830695799.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/16653068671.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/87174465991.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/legex.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/vajivoluwuwojitiwude.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/dasefelaremajugibekubapiv.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/xigelopativolakebubapekas.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/toloxefalakawokixuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=nouns+that+start+with+the+letter+kPDF 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_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 10460 bytes
SHA-256: 3b584a0875109813b288fd8b5d9949c31ba019a24b2d7a909a70963458038a8a
font_01_sfnt_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 17956 bytes
SHA-256: 946163d2a9d4789b38d72c129fcc949f4efc9a63de18bf2f75609e2632cee704
font_02_sfnt_off00011e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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