Malicious PDF — malware analysis report

Static analysis result for SHA-256 b473589c7aaf4e48…

MALICIOUS

PDF

86.5 KB Created: 2021-07-09 01:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0511a2f242e42dcd90d835ab7b25d8d8 SHA-1: 9050ad2ed5c84c5da26cf6ccc16b488a597449c4 SHA-256: b473589c7aaf4e480ad18e43c4aaf5aabeb94a79ec547405f67d8d75464bc0e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, likely for SEO abuse or to host further malicious content. While no scripts were directly extracted, the nature of the link farm suggests it could be used to deliver a second-stage payload or phish for credentials.

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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0974833762---28819845329.pdf In PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/riwapusuviw.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0adab41bce0ed1edd0057e820c665cae/32323027439.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098adaa3614b---87159423035.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81ed30b98---79227193795.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/manuril.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/42971648644.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ff7d9f29---26511356874.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/pogepovajesiwakilodum.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/2tge0hththiet6ls63hqb5lorp/50237021346.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1dfb935ffc72045dae06d19a4759a52/62759445438.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/60a3c54b544b1aaa8843a0ec0a985a81/69891862444.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607632df3710c---sutetovakifi.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2c50ffe1---91352571136.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1a01b6f6af7747c59663cfa7ddba0350/36186765623.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/608fd7ead7cb81b8503c2bf095385cac/xivufegusakutuxu.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/jurawovulazagalomamog.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/40abb742bc93d1776f77a661e64c80a1/88525550396.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/27641967139.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e2d61e01bfbe245161fc68500c5cc6c8/dabezim.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094238430c62---59558295559.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/rabexomudiguwusoromopi.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/86ea96b56d764453821358cb7f5cdba8/69141564952.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/07/tukuremulukofizoniwik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hard+math+brain+teasers+with+answersPDF 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_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 17752 bytes
SHA-256: c485f4fecab5418e11796e91a12b92b2a9039f7b93679ea1122773e15bd8a3fc
font_01_sfnt_off00011c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13482 10564 bytes
SHA-256: 501a0bab89aaed1956a2c459a68213295fb5f2313cb3caba3eeec96326bc676e

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