Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ebfa81522ade04…

MALICIOUS

PDF

138.4 KB Created: 2021-06-20 21:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e8c5b02a160e4cdd899ab9d739c436ad SHA-1: 4104a3581636eeef99142dbdbc60173655491210 SHA-256: 23ebfa81522ade04737f712ff4dab59f7b9bc8721746a45e8f5278b159ed0cd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the presence of external links and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094562b8db9b---rejubepukonugo.pdf In PDF document text
    • https://abofahed.com/userfiles/file/vokode.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/zidafetadurifewinejidajem.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071d240450af---bonoguxive.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/3urkg9l7fb0q5cpficg5uqogro/fataxutinegojabokix.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1f2309e76---15925570469.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087053c5ae93---21625060757.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/676ae5692542d0eb330f1ffb4f777828/34388511496.pdfIn PDF document text
    • https://zhansq.cn/upload/file/14587367103.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af4f115098---lezugitago.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/92993665734.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/44968652532.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1f850cd38---74434258020.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f9005cef---2560654600.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bbcf9c6c538635971fd6b8e5b67715c2/xerovukumirukofovezu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f377c39cf---jizokukotepofodajoxi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d7ad67661---mawozuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=punjabi+attitude+dp+for+whatsappPDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 6840 bytes
SHA-256: 577531cad45204afae9432f123c579108a788e8d55a049b764b7be9ac43cd2c9
font_01_sfnt_off0001430a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430A 5408 bytes
SHA-256: 3cfb824cab31d51d1aabd6d27805c0b45f94916b0b48272dbd3e9d608b163dcb
font_02_sfnt_off00015572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15572 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_03_sfnt_off000160d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D5 12440 bytes
SHA-256: 169cd6a08937dec524207ae7d8f66179c07e4737b583778d65f06a0dce073cce
font_04_sfnt_off0001844b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1844B 27308 bytes
SHA-256: 6100c3001b8110aba2d361d22ac555ac7b6cc01a204013041b8c13a72f21ab04
font_05_sfnt_off0001d6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6D1 10748 bytes
SHA-256: 25872bd8cd947af5e4b32ad983d05aa211ce4c9b2a7d46ab6e01022ed6232e03
font_06_sfnt_off0001fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBC4 19664 bytes
SHA-256: ed709a25bf6f9d7980e7fc1f615820f31f83acd0057a26f87db777ef9dcb7f65

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