Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3174f4e04376d7d…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 07:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81cde761370be5228d335f2e763db4cc SHA-1: 079c669ae261d8396ae268fbf8ec23620cddb348 SHA-256: e3174f4e04376d7d8c39a6ec5d9b30ee5b57dee0a1fd405b0de2691117c2aed4
176 Risk Score

Malware Insights

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

This PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The PDF_IMAGE_LURE heuristic indicates it likely uses a screenshot to obscure a clickable malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ab47671e4---tudezepokigav.pdf In PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/mefafili.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/96277587029.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/kiroxenikilunapig.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rotetezoniwewabir.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/d42sptgcj1tb25pbv5dmmf00kq/31394922061.pdfIn PDF document text
    • https://viceda.com/userfiles/file/bogomisenaraberirukiwakal.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/masazegojivi.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/fikamos.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/37975773086.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/binupozekowejudunadovemu.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/11435998467.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/jarafavepevek.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ffa202f764b0f8e7d89ab56c9584d7d1/9915940077.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/giworimokosekana.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/xewagibesidip.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/timojixoruvopulafagov.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/q1p8f9q7e7m0vs18k00ofpfvvn/bajuzazasosowogujadezofas.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/zirutekosedapunagufedew.pdfIn PDF document text
    • https://reha.bg/content/upload/file/80654692696.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tsfprchq0roui0e3bqrag16fk7/vonatojukefexun.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131723c74f3f---5108556280.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/j16o3g6psdt88ip8i4mq8o0kgm/98178138955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=importance+of+android+operating+systemPDF 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_off0000b201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB201 13696 bytes
SHA-256: 5a2d682922e5422ac405d96eff13df772129a9c6c2618d0d99541af6e69e233e
font_01_sfnt_off0000d3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 10984 bytes
SHA-256: 4d0c68a85a3262de4d397d970df24025912b39b44ed929c64a7f93d793678efa

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