Malicious PDF — malware analysis report

Static analysis result for SHA-256 7230d447c972395f…

MALICIOUS

PDF

88.8 KB Created: 2021-07-14 04:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 61c7f5cee2dbc15b556a4f6107f905f2 SHA-1: be18175ed72a291aed57664988bc0c70b519b205 SHA-256: 7230d447c972395f231abc5216b1f1fe1bd4b04b22eb05989b673a96d9f5f237
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute further malware or phishing content. The document body was unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/8a82rr69efjmie2d481m5pefur/mabifogagizirodow.pdf In PDF document text
    • https://evermoral.hk/upload/file/1623863742.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/zewipitobodalotev.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/7638463979.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f4d594811f1ccc43623df8a6f39f90de/gobef.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9cdee9826f0104804f471cdc20f300c3/12417600425.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/odvi0rjau13313oft2t4hgkt56/bipenolaxipugak.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/84676911275.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d1e2c80c64b3149bd92bed400f7827a6/76809351946.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c639d7cd187---muniregusuveranemuxuj.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160877fb7415da---63956745170.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e10a9b35ba---papikijosid.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a50378da54---wasigas.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/sujupebazevulovisokozoxi.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/nixivukutixivirifo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b71b797dd---ruruvarab.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/78901105465.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/745c065b2accd7c3c016255703bfc6b4/59019545751.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///guwofus.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dad8d0958b0---87621469023.pdfIn PDF document text
    • https://btegypt.com/file/72920209188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=two+numbers+are+in+the+ratio+of+2+to+3PDF 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_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 11012 bytes
SHA-256: 0c50caa4c3921cb02d1b8670475b921e3acc48bd8ae16a4dd7d2819b99c8b79c
font_01_sfnt_off000110eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 17416 bytes
SHA-256: f6074460d2514329d90845810c024233fc86852245397f5be8425f9c5c724bdd

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