Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc62c70a8cdf5beb…

MALICIOUS

PDF

112.5 KB Created: 2021-07-25 10:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0edf7246e7cacc861dc005cd53af44c4 SHA-1: 071725c2f78de08af32863c896586eccb4b4c6ee SHA-256: bc62c70a8cdf5beb964f4f4452c97c67b496769debce934e97d6e355de0f3e4d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The primary function appears to be redirecting users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://www.aicsmindia.org/ckfinder/userfiles/files/3534902339.pdf In PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19ce1aebbfcdba1aa1da86a898cd3b3d/55126285828.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160accfe0070e0---zawejebidipevesidinumaza.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/62773602158.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/rinejerabafupowevo.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/302223212831.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/63cdfff4df7eafd265d1ef99914220a6/25296689148.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/dejoxaterawen.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/45fb5e3de9ffc6333b14dfb8c555463d/78176804800.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ecb42ba8---lasakodiwo.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/c20d9c62656d0699392008a3fd893736/wijavak.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/xuvalabetap.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7f0f2f8778e8558db5fc9dda1d1d96a8/90702084300.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/10140266239.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/vegibekagenimilafetum.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/pg1veneggp0r2ike1g01dj2up7/guvejibasibazop.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609209a818767---vapixezij.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55ecdb18e---pedugaworasaxos.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1066ce835---27906516314.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16083906cafa5c---43028149047.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/165hpkbn9cathbjkkt0pgmr50m/ninaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+the+functionalist+view+on+family+religion+and+culturePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/dcda5a8473c428aa6525f814059394a5/81409058757.pdfIn PDF document text
    • 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_off000154c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C3 11284 bytes
SHA-256: caed35f1b658f357ed3b9042adec61254509c8785695645cf3422133222cb307
font_01_sfnt_off00016eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EED 16904 bytes
SHA-256: 95bdb50b93106c6b7b7df69a7454f674e606ccc05c22348a55dd0fc266b0f862
font_02_sfnt_off00019a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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