Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cc2357a5a68f43…

MALICIOUS

PDF

86.8 KB Created: 2021-09-04 20:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb6ecbc8e424170570d684f781bc348e SHA-1: 8d02c47f973a394296dfc0f50173f1be8e7a1f4a SHA-256: a8cc2357a5a68f43591c2dc7fa94f76058499c06925525c4e869f142c413235d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document impersonates a cloud file-sharing service, a common lure for phishing or malware distribution. The embedded URLs, such as 'https://ketchas.ru/uplcv?utm_term=pdf+editor+software+windows+xp', likely lead to malicious sites. The presence of multiple link farms on disposable hosting and compromised CMS uploads further indicates malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://ketchas.ru/uplcv?utm_term=pdf+editor+software+windows+xp PDF link annotation
    • http://jhdljz.com/userfiles/file/1626733903.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2331c80f0d99c81aae50546cae3f5274/20835636386.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/v74ubkl0qnv7fr57jnkos1so8c/jivane.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f446f308206c3b280edddea3ea29f25f/61716064966.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/42975473298.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607335a72ed0b---61874346373.pdfIn PDF document text
    • http://asfalon.com/__files/file/22446625918.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/48677101646.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081a0172e790---texulanakusetixaxov.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/43992007516.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/2e8n40u7bt7qfg7qdurtlgbhlo/rakanevuse.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/46111216892.pdfIn PDF document text
    • http://gerocuki.hu/user/file/21243870442.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5f7dea3b3---94131696096.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/83074191000.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/xedekivuwelaf.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f86e8960c9d73181a0fc5e83739d059b/fikasubimemubavasobuv.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b1403e09---zupumaxosusajilawewajezul.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/f728cdhofh1l2cs5d52nhajhvj/gazomimojozawiwekudoliw.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/74810431530.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1faa1b03b---24939574038.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083621eee33c---43516931599.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b35ce65020d8ad95a120b0e7de57c7b7/musazexesonexikufis.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_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 10636 bytes
SHA-256: a97441b9607027ea05cafba9cf1e7962184ddb0186a04cc45227cd488b67c045
font_02_sfnt_off00011f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F24 18024 bytes
SHA-256: fa495504d0ff8187b16e594829930ba61cfce38f6b6d6630ad582ee4dad04ca3

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