Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db0b22d814e18e7…

MALICIOUS

PDF

92.0 KB Created: 2021-09-02 10:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c4cddf8b166d42c3664782a24535031 SHA-1: 3baea23935150e3aeddad79920eae7cb92facef9 SHA-256: 5db0b22d814e18e74a51e5fce1a3204def4ff1bb9c2cbcd445f175e9717ea7fe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and embedded URLs indicate an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=danna+paola+i+will+always+love+you PDF link annotation
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f8612333a0d2f6767ab528f3f24361c2/dinonoladawanapasemudunex.pdfIn PDF document text
    • https://kaparatt.com/images/File/56634232430.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/xuroxazexidojuvataxogaziv.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/98623930649.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/vonofozokezat.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac93535b23b---64341561196.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b1a8d31e3c4758f3cb343de1f4c323d1/92683222216.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1240a98bb95f876f7c3290f0255bdcb8/5666943485.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa024c0f83e.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/5537096918.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/1820635879.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/loson.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/wawerigeduxanevomu.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68923366319.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8390f2a3a4babc55c100dbb192ea0d0f/widagukozuxebopazi.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/44576982346.pdfIn PDF document text
    • http://3sdent.com/upload/files/70510811441.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/2384390060bd54b0d3241.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/zopemubugugaxis.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/30802679592.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/keguwopelogu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4a379d39---vilifi.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/51683200574.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae58dda08d---pejik.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/17927073887.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_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 10412 bytes
SHA-256: 63197681941308b1f2722c471557caa997b6e47c94537739c9934a8e7757d028
font_01_sfnt_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 19600 bytes
SHA-256: 351dfbd7a51c21345d5d37c50a4dcb408f2ef7dcaed2fb9a6d338218d78bab06
font_02_sfnt_off0001486b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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