Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d717c8e480ce106…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 04:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b39f9d73ed0a48bdd18f838f4919f3b SHA-1: 5829f683b9d899cc2339eac42a9d456b1837f6ef SHA-256: 4d717c8e480ce10620f9966c1c9f0c85cdb7bff545f74891d1311782af04e04e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9093

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=number+of+neutrons+equals PDF link annotation
    • http://fullcolorspandoeken.nl/userfiles/file/fuzabara.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/19019421092.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/mupefixituzozofisesedagep.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16111ce171a47f---99411423623.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/19614270200.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/nuwunu.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/38694316914.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82b334222---waserabebifokotad.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/54428237282.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/eplf45nuu70lp7scs8qo397ui4/towizoworawo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4d4a7422---72282723425.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/75503731539.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7ce9a6dacb3fd9352ea32c0050bfeb86/jedomosuziwa.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a9b549586---lunebaligabejudizu.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/080fb1caef7f6c5ab2280dfe622b9e93/lasavimeriwimozurewosi.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/vebogejofawogotet.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/95168248854.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079948c90441---delunelemutama.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eab7749492---85884504671.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/8cc28a625d994ef8b60e3d24fac032d3/newixogipa.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161085159ebb6e---91494664101.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/60469276641.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/11082341601.pdfIn PDF document text
    • https://afayl.com/userfiles/file/77668616505.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/97482993602.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/zipovenudilitowezadotoli.pdfIn 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_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 10648 bytes
SHA-256: 7c11f904a185238e979a0e61c9aaab4771d7b6e55dcc7d927821addb8650cec3
font_02_sfnt_off000110a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 17092 bytes
SHA-256: 20b312d8ac38552439c3cd775c45118fca508f9c495fafdf3e8b5a25a583d846