Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d2913eb9638f89…

MALICIOUS

PDF

87.7 KB Created: 2021-06-12 10:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a15ffa0ee56c81f52eb68818b01cd6c6 SHA-1: 44c071add2de549be3bdf597645cb5b7ab71f40b SHA-256: 24d2913eb9638f89cd31e04e6c50b2da36e4d25a922de9cb568be8d848903565
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/uplcv?utm_term=36+mph+to+kmh PDF link annotation
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2e8a0436f---77739719011.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/15172599036.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/1dba46bf1731bddd3d38f7f1c3919528/37207570868.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/5eed16696f480d45387357c3a221006b/midikuxotepiriruma.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/319a73ac95d3b34c725eb64db6a97bc7/25625769885.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7u2r9jl6nnelipl6c5bpehv4j6/869996484.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2d70d0f8317b6ca24f74685afd5afcad/8624706669.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608029273c795---xexof.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a69a43efaf5---75597303529.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/q814legspgrk0u65464q4lqhh8/73004003920.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092530db1a8f---nimitizobovorulokoke.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/c1nm2gjb4nuekittvsu3nuamd5/50818039336.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/783a87d4fba38874148af4ecb194005a/wulijasebovupigijiwakem.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/9ch4ghgtamgalg7jfiooo8mss5/wefazodewiwoludimonanipet.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/58057066664.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn 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_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 4348 bytes
SHA-256: 0c16b071de2168eddb754bce326755d8dfdd70e0c06fed361d8d96debd07f71a
font_01_sfnt_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 18708 bytes
SHA-256: bb96d0138e1c5d867cad2ca8e5b5b20480ab7d2855bbb4337f2e25b80fffa5a3
font_02_sfnt_off00012e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6C 16216 bytes
SHA-256: 5cb4188777f33cd410073f8b9d14bcb5a62f3956273c75e1cc66e568e6902af1
font_03_sfnt_off000143a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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