Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db32e24aa655165…

MALICIOUS

PDF

72.2 KB Created: 2021-09-20 22:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d5369070805607238d05f0004002fe93 SHA-1: 3aa3e78ed3af822b552275202d7f3af55c037ffe SHA-256: 5db32e24aa6551650cdbceaefd35d703af3cbde40f303f177b8aef8e54065b5a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to mislead users. The ML classifier strongly identified this PDF as malicious, and the presence of multiple external URIs and link farm heuristics supports a high confidence assessment. No scripts were extracted, but the primary attack pattern involves directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://nomylo.ru/uplcv?utm_term=fast+and+the+furious+9+yify PDF link annotation
    • http://dr-temt.ru/images/file/maxawagewilepumejaruruvul.pdfIn PDF document text
    • https://hgb.se/filer/file/venawugazamazidemolu.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/67266616043.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/55793882641.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/70951868076.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/sajilolulu.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161322d2a7f458---begebovupirowe.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/82366821018.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/88239652615.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/5967731575.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/13369079262.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/nafugupefovafijaroluta.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/77658659780.pdfIn PDF document text
    • https://tpk-m.ru/files/file/254445022.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/824bfc62abd562cafcacf582f5fa8428/66346115558.pdfIn PDF document text
    • https://sudahhabis.com/contents/files/22935240200.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/u67etlvpu3f8h9dmlcfmc97h2r/garegiwefixupiluvin.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/20275678729.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE87 10764 bytes
SHA-256: c6482debad00589c02253c0d54ef13ff37ca1b9ac1a3bd34f2ddc9d06dd22f2a
font_02_sfnt_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 17428 bytes
SHA-256: 547788eccfc2d57e1738245050e0af968df016a8ebd8eb17a717520268a203dc

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