Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dcd967174e6b0d7…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 15:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2896d4b65a25385e746ac9cc46fc86a6 SHA-1: ec365fea1754dd1cb5995f5ea63c0046d4843e0c SHA-256: 8dcd967174e6b0d7208184c7cdcd2e26e7480a3ea09b362e783b466d2704beda
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://prompol.com/media/file/kugobemufofe.pdf In PDF document text
    • https://pet-fashion.ro/mm/file/42314325073.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/kuselamoxafojedolividanin.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/56843810393.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/82522656399.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/90991593256.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b40a67736---98984418940.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/98875864063.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/80093151716.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/41354784550.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614713e807091---4755581235.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210905075338659.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0aff2b7d1---javidometew.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/45662425916.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc1b9410a9---85065090934.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/dilorufetexiwaj.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/natoma.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/laxujijew.pdfIn PDF document text
    • http://videocycling.info/files/file/61418629427.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/52944810104.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/27884532914.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/vekizijomitedi.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/12986333076.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4eabfd75b80da87ed98039bc349d3623/fixigaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nature+live+wallpaper+for+pcPDF 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_off0000b62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62B 17260 bytes
SHA-256: f9c472b59b1dff78e24a3af71c8dcfec3bd4697aaead3d40f00a738cf0a9f231
font_01_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 10432 bytes
SHA-256: cbd0524057257b21645182d281b2b8b1e20c5f7ed11583df24521551c96c3a37
font_02_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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