Malicious PDF — malware analysis report

Static analysis result for SHA-256 559d167415a01cbc…

MALICIOUS

PDF

147.6 KB Created: 2021-07-30 02:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a984e9952d5ac474b102f4a3966584df SHA-1: 2c652fd8196415a62f6cdf4677e2b7661cbe854a SHA-256: 559d167415a01cbc6140be05e09845802990d9c60b2d3eac0d1ea9116887edcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true destination or distribute malicious content. The presence of external URIs and link farms strongly suggests this document is intended to lure users to malicious websites, likely for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://irlanc.ru/uplcv?utm_term=c+form+meaning+in+malayalam+letter PDF link annotation
    • https://kenadong.com/contents//files/pexagejedofevax.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff1333ec80---piluwivixefazogopiti.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210725021111.pdfIn PDF document text
    • http://kotolantopeni.cz/file/44275742671.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/52762601773.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69233cb958---punekeruza.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/59546231856.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/fezanigatolaxexalu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b6fad119---50551102536.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b50c23ce88---94387853238.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3dcf245c6---nefanujirixoloba.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/37938260927.pdfIn PDF document text
    • http://geotersrl.it/file/woginuda.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/didof.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608341036cf65---83916303605.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/33794857793.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ba64ba32d844f821b688d63493558030/53776517975.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/f339hk15htrmakap0ej8vah9c5/56868943266.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/bopeg.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/61f85a6117b7caa99c8c500699410793/38992566125.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606fffe6a46b0---pigeme.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d45a0dd154---fugupisiboravukawi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160844d61ee041---4360750760.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ea3d262b4dc0ae52b59855e084249088/8379786905.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2BB 10532 bytes
SHA-256: 89265546059c7963ac8d49679ff69566ae04e7daa2c67feb55de6dc9a1036c5e
font_01_sfnt_off0001dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DABB 20164 bytes
SHA-256: cbc3c3fde41e9f07382a8b430c67868f75c73a7e65c7c3d76c2cf999cc013b4a
font_02_sfnt_off00021065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00022876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22876 16092 bytes
SHA-256: 4ec097fded2b2008e4fd109a9c1aafa56e1caeddde5bbf8325efd0314ffa783c

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