Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd13d084a7acd3c…

MALICIOUS

PDF

84.9 KB Created: 2021-07-03 16:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6da57936946c73ad41314df875c3f09a SHA-1: 2fbcf0271906984c8eb3e0f19758353b1be3c357 SHA-256: 4bd13d084a7acd3c82680ee251cdc86ead8761ca25f579703c4542d650c947a3
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or redirection mechanism. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, a common tactic to trick users into executing malicious commands. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://citra.cl/userfiles/file/fawowegezokowe.pdf In PDF document text
    • https://sasalidayanisma.org/uploads/file/24803630082.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/66ac7593b310b8a57a67e4a0697e3e02/28248556338.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/85963117181.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b698bc3d0bb5a9beb83a25ff57fdd9ad/98585557053.pdfIn PDF document text
    • http://groupkaishan.com/d/files/53830982626.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/beregidijitiwak.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/limololure.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a8e8e5f335bac8029499ed2b6cd654ac/66740250979.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/fovibakinademo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824652a01d0---78600170456.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a173bded73e0e2705b53551fd044b0b6/medemutewowopobagavu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097996ab56e3---36122398106.pdfIn PDF document text
    • http://temple.mo/userfiles/file/nudegizuzilare.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/pifazatudekiturenokujifot.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc20ca1c837---35054082196.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/xegolufejivufolivekoka.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/79066001205.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/72992836855.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ljhf1sv2anepipnatmd5bqm4s3/pupojeloxotovelujonaxoxo.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/66288247695.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/119e884cd7f371897c680349f30e1880/132032662.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/10f414348c3d8022009ad3a01133ae3e/dupilafufimomagupalut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=combine+word+document+and+powerpoint+into+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EA 16076 bytes
SHA-256: a671d37c7b3b889284622d243fc9727f378cc914a66da79eb58e164c6b93b0ed
font_01_sfnt_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001001e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 16908 bytes
SHA-256: 4d88f5d0aa7a05aedc4fb16308d902d9f148a23ecd607ded76c04c4494873b98
font_03_sfnt_off00012c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C73 10924 bytes
SHA-256: 474c7bf11ccc34b8a272f1a96577484737d7ea303c0fe930d6977ea3d0999a9f

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