Malicious PDF — malware analysis report

Static analysis result for SHA-256 11597e9a3444cb35…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 08:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5a184dd3ddaff4757a0b23741b149b2 SHA-1: 8dd6c5906e0b49b11e18332b7b36e7a4ddc41572 SHA-256: 11597e9a3444cb3529ccaba70ff47f7ee90394e6f549b212c17481eac0ef229e
176 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, impersonating cloud services to trick users into clicking malicious links. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=baixar+aplicativo+gmail+para+android PDF link annotation
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/fe0eaa075040865b32d14d2172d919d0/43541823366.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109091234135436.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/3ftimq3qjkc220skd8r4rsi6s6/31061699039.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2278cnim99krfjl71gi4g3g526/vomekifuweralufux.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/21904843921.pdfIn PDF document text
    • http://indexone.ru/upload/file/sedifafemojexawivela.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130afcc0e3ba---lifirapad.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/73963702025.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/zemewosopenuw.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/52585957400.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2fb4ce468.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/6790241173.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///muzimokenoxupexoxumolove.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/luwikajefazakemegejil.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/98990615744.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/84346730761.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/zelonovosusabisatipodagad.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/45256793783.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/zenawe.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/29583522964.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/nusokojoxovosilitek.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/79603811286.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/43386159840.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/37342560736.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_off0000dd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 10776 bytes
SHA-256: 8c35bcb4e4fe6c1e029609c7d2f6e8cde32fa6f678615891f0e7654b6d85e99b
font_02_sfnt_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 17408 bytes
SHA-256: 5fdad82acc2b02ee0d53987e93eea96069af9e058ad81987b42fbe37e530156e

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