Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e954a81cd2cf0af…

MALICIOUS

PDF

83.4 KB Created: 2021-08-27 09:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bdc6efc8264a749a0762489b0b56228d SHA-1: 5e9f9b5bbf65b71c78c33a9a3d0d50961de551ed SHA-256: 4e954a81cd2cf0af52dafe4993de0d14f73bb958dd38f11e446c1ce4df696661
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a malicious PDF, as confirmed by ML classification and ClamAV. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations. The embedded URLs suggest a phishing or scamming attempt, likely aiming to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drafthe.ru/uplcv?utm_term=introducing+a+friend PDF link annotation
    • https://people11people.gr/uploads/File/xiwexazigiwixezubesu.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105150835.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/892cdb7662afa86732e30a3e7f677956/62202199411.pdfIn PDF document text
    • https://best-label.com/upload/files/tonavutalilov.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fc7e2fabe---17929587403.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160983e489788c---guwixamen.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/283273728.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/a042528c9c9e066c019fb576362f4c1a/59270027949.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/6qj3uqgk0b2f72j2t3n7dganva/7413077321.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/11223686172.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/18654402074.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/wamorawegizepezu.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/57705709431.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/likisenepevususugajibom.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e6087b6e7---99559188334.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/fekiguxoxozinopijera.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a04d3e7c338---55734880930.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/2d4bu00v4gl9pd0ltbm7h842me/9199483095.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/43929821231.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741c5f48634---20243937650.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/ff93ef97709ccdf485566b92b5afd2ba/23344258341.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bae3a46ea6---lufiwufezuzegizomur.pdfIn PDF document text
    • https://electroagro.es/pub/files/60116810540.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d05bda22a03---nonarupat.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610acc641c70c---molujim.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_off0000e2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E5 17008 bytes
SHA-256: 5763e0e20e160c836b47e61b5d3ddac7089e95371a3f34345167530646406de7
font_01_sfnt_off00010e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 10488 bytes
SHA-256: 854dd19204ebb74511b7e33457386ca2b963c6f7a74fcead61639167f270bfc3
font_02_sfnt_off0001261e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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