Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c89979247ee9d00…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 22:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e4cac874a68fe9f82a23f2c28c560e7 SHA-1: a583b302b319f24a04286414450985a66ae6766e SHA-256: 4c89979247ee9d00a26880e62af4232ae106bbcce6cdcd95b7246eadd662bf21
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites and a deceptive download button, indicating an attempt to trick users into downloading malicious content. The presence of embedded URLs and the nature of the heuristics suggest it is designed to exploit users through social engineering and potentially deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=n910s+firmware+4+files PDF link annotation
    • http://kmbb.at/userfiles/file/7528084041.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/24952676001.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/80646185660.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/7438065689.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/saxur.pdfIn PDF document text
    • http://eichler-kammerer.de/85615623708.pdfIn PDF document text
    • http://mayjack.com/upload/files/72644630980.pdfIn PDF document text
    • http://medigroupvn.com/upload/files/25783210609.pdfIn PDF document text
    • https://umutfm.com/resimler/files/42288824900.pdfIn PDF document text
    • http://mp-journal.com/media/file/76876307350.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210921170446.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614463cb40e4d---25682701025.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/046f91d40bf42580e834dff6afcfae94/10477515776.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/34336296294.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/nusonefefamobe.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/99b950e7d3994384e667af5e9390b7ab/72726776619.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/75970304833.pdfIn PDF document text
    • http://grimastone.ru/files/sotavofigolabinutula.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/wegivinefevovagiw.pdfIn PDF document text
    • http://montesantangelo.it/files/files/midifadebela.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/ranir.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/komovozog.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/navode.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/zawamobijis.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/86325282126.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/nevodemoda.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_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 10536 bytes
SHA-256: 55f72b2a1fe5c22aaa06b4f9588ba00980c16a0b24fab7fec950909d26a61888
font_01_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 18560 bytes
SHA-256: 813a017f6bb88d738a95889572cc1a636efb4059f87dacc26368fc1cb9af856e
font_02_sfnt_off00011fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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