Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcc6715959abddb…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 00:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 78758e6752d8bbefb9972535957f4913 SHA-1: e5934578168bd0d957e2070017171def78541ebd SHA-256: fbcc6715959abddbea19da93c69561d275d1a3cf6df52e55f5fbd88c2674eba6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/87966574356.pdf In PDF document text
    • https://worldmedglobal.com/userfiles/files/jigupe.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/radiwit.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba9c1a889---piralurekani.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/63514619381.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/24799298710.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/75137326489.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8bede9d59---40105722342.pdfIn PDF document text
    • http://hidropro.hu/upload/zinalu.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/velativefanuv.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161422413b73d1---11388420301.pdfIn PDF document text
    • http://www.grifin.sk/files/33465859349.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/62912289878.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/lulawusabowusaragez.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/nenodoguwuwofewobowuzewa.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/6471868717.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/nelaxoduw.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/tebubojinekekakota.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/dituvaperanuboforof.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/nawelupefidagerufaxop.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/kaderirokakivurabimofas.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/genubiperavovewujabadasij.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/jorixidagogisepurezolu.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109201858186762.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/17126162877.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/labidaleriwugitarotawuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+ringtone+namePDF 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_off0000b512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB512 15208 bytes
SHA-256: fb62502d057577eccaa12a9f4e6d3dc4dd3ac285dba51c73d404bca0901c919c
font_01_sfnt_off0000db78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 10356 bytes
SHA-256: 10f25f2837833a7b58b56aee37bb5ea8a1ae7ea8e7652663b3e4ea3f287a3a5f
font_02_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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