Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d990f0cf39e947…

MALICIOUS

PDF

75.8 KB Created: 2021-08-13 06:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae35166c62ec28e0b549b36873240a12 SHA-1: 78a54170ff99eadf71b67a3cbd63cfe0af0547e6 SHA-256: 66d990f0cf39e94701a22dfe63b180b1781411983115c5d60c4dab9c9e75b5e7
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on compromised WordPress sites, suggesting a link farm designed to distribute further malware or conduct phishing. The presence of multiple distinct hosts and the use of disposable hosting indicate an effort to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://acrgruppe.de/userfiles/file/36628054434.pdf In PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/bsmmpllanvd818vn0ddpors2og/kotizazilukoxenikagovunur.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b67f526ca5b6b0f889901ce0ea2bfcfc/96622702289.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/190622546291.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/kofuzigiduzoj.pdfIn PDF document text
    • http://millecolori.it/images/file/fojag.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/7726518032.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/xufisezuzuwonotu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf302dd193c---82999982764.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608415b80c52c---42588715314.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/84223815658.pdfIn PDF document text
    • http://vizcsap.hu/files/file/97215950383.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/dozurujemasulopewujafuwod.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1d78776ce---43125155014.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/kinisukusu.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/17051056108.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162723583314.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf334f121c8---povapaf.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b095c1d42---98552868561.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/10790826468.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16099d74762d39---telewobuzikoloputibixija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=examen+de+diagnostico+secundariaPDF 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_off0000c1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F0 17548 bytes
SHA-256: 8989d14a73978c10889e95a46ff39857f4f9681947cf9bba32ace8f1a00219aa
font_01_sfnt_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 10852 bytes
SHA-256: 60f147b5f5e48292ec5bb173826568e3c187b710d7f883645a775e305f186f68
font_02_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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