Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3b2d2d96b7bdc3…

MALICIOUS

PDF

88.4 KB Created: 2021-07-16 18:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a9e0fe1e830ad66c837f0d65b63e1751 SHA-1: dbd1d12ce59a461b87a678308a734ac0e5d562d5 SHA-256: 5b3b2d2d96b7bdc343290f3c80ce1da91b99d07124840d6be9dfa3fdced3cc8a
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/2o6ubj5bkg8bbj2j20b7jfir5m/92671418144.pdf In PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/0541fa623b29ff3ed402f8a4f20c0673/40511233028.pdfIn PDF document text
    • http://mitra.su/uploads/ckeditor/files/38662323458.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b45ec2e14f6---fepidugerutuf.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/68859409002.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aba06c8a626---buxolopigokusejujemu.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/43821852190.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/a52e8b522e8140684cea190c0c7013c9/46212865446.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/89200393541.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/b9p3vk6mrbh95l6ij83dgpalv4/musojibarunobamisedep.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609057101bfd0---33700443224.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f6c9b67cc8017a4932e49677787db498/rawezigiriwidatobidaboj.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5ca62f7d23dad89019ddd807d7081062/50464342403.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/lukujegirevibuganetuwerur.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076af5518da6---jugemipetas.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4c46510ed063a88720c35ded823c741/92486544183.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/wumurujuwevunoven.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609403d43f694---zovuninajad.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093769fefe33---97191526984.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/98667967783.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/71319339402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pmd+to+pdf+online+converterPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 17904 bytes
SHA-256: ef7cb53d35caaffc0dd920d14ca4aff528d6b723b0cbd00ebb3b0853a6c44d84
font_01_sfnt_off00011a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001324e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324E 10520 bytes
SHA-256: 33477d60084c7e3f9210d45dbf8178f314ea684cfab923c46c47ae9616d0f05f
font_03_sfnt_off00014a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A22 1760 bytes
SHA-256: 478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24

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