Malicious PDF — malware analysis report

Static analysis result for SHA-256 384c67c7acce5e6e…

MALICIOUS

PDF

72.5 KB Created: 2021-09-04 20:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7941245556eab0136381ac4dddd5c71a SHA-1: c87af0f50884c3a88ec08e82e16dde5c3c873b92 SHA-256: 384c67c7acce5e6e75b584341b1a49fd212b246a6f381cd72fc6a510b30117df
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download' button lure further supports the phishing and distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bosingels.nl/ckfinder/userfiles/files/99430780541.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab84ebcb637---15435944456.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd0c2626ae---manunod.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/10075783173.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/4c621e071cc50e0bb06bb04a1dd46079/97582193871.pdfIn PDF document text
    • https://yuktogel.com/contents//files/nuzivuwosugebafa.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/21777957385.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e139a9327---wemijuxixebobifesokijo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/11768092857.pdfIn PDF document text
    • https://kristinanamaste.eu/files/pemadukapuxake.pdfIn PDF document text
    • http://cycling-software.com/files/file/rujuzanulali.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160988e09012fc---lalozigilonoxivasuxazajov.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c53b5eb6a8e---juxaxitefaligo.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/fogimopoxalowatamuzizer.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/benilagisuturukenuxulen.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084cdca0b335---54650395643.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210601_39116C1030A9EA1B.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/752fcd4ea9ee432e81c23840b6c37f62/fovenifiligipudodekimir.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/bc78dbe04d9d2b1b3993d140ea1eeada/bugowemewibumiwotejuwox.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd42f86ca7---roxabigobimagugizim.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/zikodireruxexutavifi.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/wezida.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ov5sgbkt552d0h4tsn2u5vcl2n/59453510253.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec16d5bf2---69157587793.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/gemoweroma.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608e96053f945---kizemitatig.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/dm0v1umos5134n6ao9bc7ig9c6/19015266379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=free+warhammer+40k+codex+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A9 10836 bytes
SHA-256: 807ae3bd23671cf8b1acf8c2f0a42ba0326a8f677f75fe6142f6ec5276640661
font_02_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 16520 bytes
SHA-256: 9bd07aba8d820b31f6f0d307d7a61ae00afdbc9c8f15d827326486e26947eca0

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