Malicious PDF — malware analysis report

Static analysis result for SHA-256 227b129b6b4cc247…

MALICIOUS

PDF

106.2 KB Created: 2021-06-28 06:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca6f83be680abcb8b1352ac83d3ce0fe SHA-1: 6fa64b3d003c884f27019c7cbc98799e33e42368 SHA-256: 227b129b6b4cc2479a6203866d8e574da503166edba73151634825abc9b8509f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bc2356f8676d4cc3754dd6bc25ef7ff/gupuzajijab.pdf
    • https://gujaratisamajparis.org/upload/files/4069122323.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c9cd01152d586618a848cb542e2bdaae/difolus.pdf
    • https://ghnservizi.com/file/25263828811.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd1c269e88---28251975979.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9e085a46ee67a3b8164788e76454be23/xaxekenofe.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1b909e35749866b018a74cd93c4c53fb/89458771538.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/27903477500.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a316bb5c0---xakitexavofojijelijupo.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d343c8fe97---24121692122.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5f3af5edbb9b9631193cf2e049f01613/47215135827.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a31721a052e---serogekokibosikigabiwed.pdf
    • http://mai-colle.jp/userfiles/file/9271946062.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/11778154155.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160afb6fb677a3---bobokebete.pdf
    • https://alnahamgroup.com/userfiles/file/22921869236.pdf
    • http://pospatrans.cz/UserFiles/File/sibaduligum.pdf
    • https://kis-u.com/page_data/file/20210621224935.pdf
    • https://ascinfratech.com/clientprojects/trading/file/92511303969.pdf
    • http://alnoorcity.com/userfiles/file/51440290145.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082d5f0a58e9---buxerutukupajimudozogone.pdf
    • https://folklorebridge.eu/uploads/pictures/files/kidomuk.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160911414b603a---55765849038.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c734e0a22---95564339444.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac614d0f17d---75600536370.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=virtual+lab+motion+with+constant+acceleration+answer+key
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001376c.bin
358d721550c435f76cd6373766a1d00a1eddbe2dc671959403dad9292f589dc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1376C 18180 bytes
font_01_sfnt_off00016750.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16750 16792 bytes
font_02_sfnt_off00017f67.bin
64fd3ea22ba86a0bdaa9f95436c11a8b06ef04c15b83578de2d9b6de9c18246f
pdf-font-stream PDF embedded font (sfnt) at offset 0x17F67 10996 bytes