Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56a24075fb05976…

MALICIOUS

PDF

89.7 KB Created: 2021-09-06 02:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 052867d7ba8c9d8da82754feeedd74fe SHA-1: 36454c962c3792d60bf05d1a7b5408b3e9c06e03 SHA-256: c56a24075fb059769c9bd2e2f637bcaff57822eb0fcb5aa017ab245da51a6b93
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to lure users to malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://alexlunacoach.com/img/editor/file/25698560343.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105a84a56563---duwovefune.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609170180378a---rekirotifipuzajiripe.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/rh9b33b43eu5ck18rifakdr227/pipej.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/68210596941.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/37378361449.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/1187302516.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/9aca3bbb55a9d649f89bb106e5247be3/96754712903.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/83166456666.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/tiwunezugo.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/dabfc9f84866262da97d749da061d4d9/13793883858.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/sigofogobis.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fdc0bc980---61454479311.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/p4g7uguhmb41jfpikd8p9vijc3/garozitebosemo.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/42146511451.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/xutod.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/xoluwujewozopopiza.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021071304503980554.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/vakezufopefobuxugi.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/e0e2e5bf2e7f2c2b817aaadc8c08ec8f/witojozubesipafo.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/5bd6ebf6e26a83461f97284706dda892/fuguzusu.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/83702760278.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf487fbfa50---89078822545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=translate+french+to+english+pdf+documentPDF 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_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 11132 bytes
SHA-256: cdf3d9881e612034fd22d8005d8876239826721cfe74fb565b35d86236435bba
font_01_sfnt_off0001100d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001281f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281F 18996 bytes
SHA-256: 673d98386b0b3f0630fe3fecd01a89d2950b77e0422a6a7d1e90d53e8932bada

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