Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ed954368598ca6…

MALICIOUS

PDF

72.1 KB Created: 2021-09-14 02:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b867c5acb03637996c99939c7634cd6 SHA-1: d6be779297b2825b7f4e37f444b06214630c0f49 SHA-256: a4ed954368598ca6f41c0b47f192e290946a2fa083e796a2dd2751ad65fdcd84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware hosting pages. The presence of multiple links on disposable or compromised hosting reinforces this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3aa0aa84f---pamofegiduwo.pdf In PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dd2119635f0da92e81469385db5a3d47/gukamewelaperunafawusad.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/40450850868.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/womozupob.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/1fdf939c7a749fe15a5a88eb8e7ed3c9/wapafaworowaxesejunirar.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/niwefizim.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/jejujegorinuwalalom.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f7ec4ee7e---83585021996.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/wimimusujidejejutijoz.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109081917521130.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/xajad.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/pobin.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/pugoriwodewurabi.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/61081536546.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rufizux.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/topokaxuwizusok.pdfIn PDF document text
    • http://pololanna.com/user_img/files/votidu.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/neferebivikesavo.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/47334552486.pdfIn PDF document text
    • https://guijek.com/userfiles/file/60429200622.pdfIn PDF document text
    • http://esangsok.com/upfile/files/repodusu.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/jejejulemaremikik.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/wuvas.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/bosodef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=feet+to+radians+calculatorPDF 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_off0000ba79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA79 15936 bytes
SHA-256: 99887a64560b3b71d188f666a9ae4a4ceeff80d57d5ae5cae9203fe38a9680bc
font_01_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 10440 bytes
SHA-256: 1d552d30d94d0cc59696797b23af97af2b48bfd63e37d6228ffadf3bcd1cb50f
font_02_sfnt_off0000faf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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