Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b1424f98fb853b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 10:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7139ba5a19b81e81c9f7d0f1670765e1 SHA-1: b178225b2fe107d6b0b1714f6270c287fdac7157 SHA-256: 19b1424f98fb853b882660db9dd4c98a235034e92312e4dff15a3bb572f02746
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'wkhtmltopdf' in the metadata and the 'SE_LOLBIN_RUN_COMMAND' heuristic indicate potential exploitation or abuse of legitimate tools for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://smidgel.ru/uplcv?utm_term=city+of+god+book+pdf PDF link annotation
    • https://serwisnawigacji.pl/userfiles/file/vokuxuxalozarodadoj.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130de1e3647d---vufugipibe.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/fokujujuraniwofofexi.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/potarituwasorikoduperivaw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161321a907c4da---5615174093.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161330e212b796---befeped.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/90831048681.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/bupuvogonilewef.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/64176557238.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/65236040752.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/nevefisaguvo.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rijexivigewadujob.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/mubetuluxar.pdfIn PDF document text
    • https://granitnet.hu/editor_up/sisuvorefusivofux.pdfIn PDF document text
    • http://praguetransfer.com/files/file/92085582981.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/fupirenapemebenunepofa.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/xewajutuzuzadupenuzasa.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a7aa5c642332a76f36e9dfa4e93c0f06/pogujogib.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/11267295528.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139866829038---63994309713.pdfIn PDF document text
    • http://kccmaul.com/files/files/gakojixisusanipukumebiz.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/14785829995.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_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 17788 bytes
SHA-256: 52d132918494b6282f14b50dc2ed0c1e53c4349ae7133b7be11854ea939b3d69
font_01_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12427 10336 bytes
SHA-256: 00b3f727bba8aa584dc50e178d1134ae42eaea115dd4409be13f6221ffc86ff3

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