Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb686eb6876ee12…

MALICIOUS

PDF

83.5 KB Created: 2021-06-30 04:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b5d6c5f00dfb668c2c05c5d5c60a69e9 SHA-1: 5da9bc3cd478fab2001f8a7b31e331adca353fca SHA-256: 4eb686eb6876ee12b4d0abeb2a301d9743d10ec3f4edf75570bd10459a1e93ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1525c4f4bc---soxonalukaluxojafenokif.pdf In PDF document text
    • http://biosite.ru/images/news/file/wofofatulufobadavutejimu.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/fekalewolewosige.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/pjp6gm7apappck36ujm4t7e375/3448381993.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/mavulub.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/p4hrfbfc400pnq8umm7ag7bqfo/karitofubuwomonevo.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0emohqqqk22doe0j36vmh3qf5k/21575954940.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/sulefupel.pdfIn PDF document text
    • http://freeski.hu/freeski/file/xititi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/0l3q9t9l9s9jrd4d1nq24uf5ls/14992642258.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/67762517787.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/93849949660d437e2103ba.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/73890853215.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/5775693872.pdfIn PDF document text
    • http://anpo.vn/upload/files/towamuzevuliruzami.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/makenuxaxejurif.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076dea3ab33a---vurofafewi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc2e2afbce---87534662162.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160773c1bbf64d---sasodaxapupa.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/34981206426.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/52cffde8b5d03fb840d408efe871ef38/95953587710.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/77308265956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=rice+mill+plant+costPDF 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_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 10480 bytes
SHA-256: 0a93f0ccc2c4e9dba7860f71130963fa6839f4b038bee29b54ca4853d36843f3
font_01_sfnt_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 17004 bytes
SHA-256: 8f72ea0a36fd739b3d21b0d3b3d231ceb9881593755ad2999b28488f73e55a53
font_02_sfnt_off00012927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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