Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4279378082eae2b…

MALICIOUS

PDF

94.4 KB Created: 2021-09-06 07:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84ca8725f1f363fc896e1e920c9ff67c SHA-1: 57cdacb20ccc117442c5cf8c8a9237bee04a1758 SHA-256: c4279378082eae2ba77439af2b7b65791133fd78af5946da20452e765739bf25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=thinking+strategically+and+creatively+pdf PDF link annotation
    • http://sun-green.be/ckfinder/userfiles/files/28307562064.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/nijomi.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/fupif.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113d7d9121dc---55628319455.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e45b6beb5---mowekolofomamisole.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/benutoxawef.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/taroxipalexovubodu.pdfIn PDF document text
    • https://stormester.no/files/file/pulagatetixopozivit.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/vejajikefudatika.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/nezixodivofezobamulerido.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4282861f1d---dowavisazare.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/lulab.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/5da1a165cf88fe0856d661355e12b43e/xakuzebinofuganotimav.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b0661cc5e---57327491772.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/23975062516.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/wofefatetep.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/xomaxepobapeporufopexosab.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ie6sbup8vfijk2ghovms293rh0/pigijudusitinuzi.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/93013827349.pdfIn PDF document text
    • http://zxsolar.com/d/files/6289293285.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/tuzekumigero.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/rimenejopunapumepiberopor.pdfIn PDF document text
    • https://artenika.pl/fck/file/ragowipukivemakijiwa.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_off00010b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12355 18292 bytes
SHA-256: 21aeaa0749c77573cb5125c61b7201d93f41a5b3a28fa9ec4c6c70c6655dd4ec
font_02_sfnt_off000152a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A6 11016 bytes
SHA-256: 96f5cc115a358c03a0d432faafadcc54c1b51309de83c070742db724d1194d75

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