Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4aec679156ba9db…

MALICIOUS

PDF

86.9 KB Created: 2021-08-21 22:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5bdf731479de727b8e32439e1165c852 SHA-1: a10591c735f10c5bdfd857235ecc301c398be353 SHA-256: b4aec679156ba9db861c4741c8f8f43e59ec0b7b9d577769c4ba311364f020fd
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to delivering a secondary payload or redirecting users to malicious sites. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=download+game+crash+bandicoot+on+the+run+mod+apk PDF link annotation
    • http://topas.lt/userfiles/file/23676316245.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/92188103937.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/nojigelore.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/0bd938b713496d0ac10713e74c7cc1af/jofabipukupopup.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d5d9695f7---pusolatijixulupodizoxi.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/bagajumudexetakinonej.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/70680491395.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/1gvjh4pk9pnfohfcjbl3sbd2bl/nesuzamulemajejino.pdfIn PDF document text
    • http://myphamasia.net/upload/files/jidajagikekugezemak.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/f9vh6dj0c0j5h493m4pqkfjig3/83275863080.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160768a6559f2e---suledasevedimofimekikevil.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/29469923274.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fewiveradoledarobisev.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/7986583894.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050912084162.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607886f077702---bozufaragitiduzijobepo.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/memarulidemejozi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855db7cd2d1---sawiganovukafemejaja.pdfIn PDF document text
    • http://npas.ru/pic/file/damivun.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/zudoritekesu.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/55770525444.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/70961500214.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160928f72677ec---zajupojerogiruzareven.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/fopubaxafifapodonupatiret.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/67606381879.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_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 16752 bytes
SHA-256: 1be96ea13a7ed6e3dc767e0e43ea4f9b4780d5b678173b9aa6877f542a763e46
font_01_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 11380 bytes
SHA-256: ea145a441c168dab3708e3e02f9c658ce03f19bd1ac9bdd877244b87d4860164
font_02_sfnt_off000132ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1