Malicious PDF — malware analysis report

Static analysis result for SHA-256 159024e81d57a5bd…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 06:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 58a72c71d5fdfc208c94e1dc67af827a SHA-1: 68eca119d0f1166cdee0c05590722cc754125405 SHA-256: 159024e81d57a5bd9a37fb4915034f4c91ebb081a98bcc2401ff796333827eed
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains. This structure is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/d4517ded12c3948f1f0dd7be9786a3d9/lepeke.pdf In PDF document text
    • https://thietkevuphong.com/uploads/image/files/lewajajuvelanexazenube.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/21942020011.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/lepuvuvunibutawejajoxesul.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/67034030068.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071a81c92055---luxogasos.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lv308eq1ea7o7pnsmb1deeeavu/29480288085.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/84605656968.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/84126241020.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/gepezeroxewewu.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/55142295263.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/baxasirezetozijedoki.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/12647944876.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f58d0aa6b---wofoxifelume.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/75448997427.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qm3qdlpv8p0l7uauqpmpvn5knc/91974508344.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f43f8e7326690e43b11606ad5eddc88d/pozowefesalifozubazofe.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/natewe.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/musovovazasiwakesorelusik.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/77320930999.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/620b8c56b8e3943e98a42f63f1fac56a/mijewalo.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/30393484007.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/vavoravub.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/siwudolokenakoz.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076d06d6c259---718504563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=greensleeves+piano+music+pdfPDF 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_off0000dbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFA 10888 bytes
SHA-256: 80a3cfb36e5a38bcd4b43d1ef561eeef559f6757268855dc7a106f5a155efed5
font_01_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 18344 bytes
SHA-256: 7ef5eb8c33cc16117cbf39fde27b9fcc8bba525400cdc1fc6c72b24d5d7e5a21