Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e7e75d29ee212c…

MALICIOUS

PDF

84.5 KB Created: 2021-07-06 01:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 41ea8b13ba0f59bd69f136f0957bd46e SHA-1: 73d41a01c6137e052270f4ee399d3e226d2a2776 SHA-256: b1e7e75d29ee212c349c0264b83ee8fbb8aafcc6813ba20979df6403d113b3fb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document body is unreadable, but the presence of numerous external links suggests the primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29204a3a5b---71993876755.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ba8a70de6---nekobup.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/64464751869.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/b79rulepbf0992tqqrg789sem5/buzanuvegibil.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ueuqjcoj54nkslh3guhpm5pk0j/mifufijokigoxorem.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f71a794f08a71ee90441c7ed42c986f0/23749360304.pdfIn PDF document text
    • http://usmleworkout.com/files/file/tenasiwegazeniwenud.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc0eb3b1fa---96674213912.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/b42f42cef08a137c29d2576603e81995/xozudosumibagivamujerana.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021052919303880554.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5c28abb632626e42294b4e451d7a7755/62187658299.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021070117463073499.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a40fb92bb4---26052883209.pdfIn PDF document text
    • http://scro.ru/pic/file/musupezarabom.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/9f6af29e81815ac8420158a771defd57/97626288554.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/23346159998.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/waxoligojonop.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vmshba89rmkh074iafkrrv5icm/lugixolinane.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/kenisegibamelinigekasufo.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22896d67d---68310006907.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774f1839d13---28202026760.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/sevga6gll23vrgbmgo0vt1hd83/mexepasujevis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=easy+games+to+play+over+zoomPDF 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_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 16604 bytes
SHA-256: b0c69ba7457f31fb716f42130e60af3eda03c8e8c6d4743a9c860b9c8bc5f2e3
font_01_sfnt_off00011462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C79 10624 bytes
SHA-256: 2f435dc2936546d518f37bf6d7fa0381b0f26dda1ed2fba6cca1176fef282b11

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