Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d853d97e7ae47a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 15:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f7199012b58fa0cc1e530d3f4682c9b SHA-1: 345c1b6b124e839f5368275d4e844ec85a983e19 SHA-256: f5d853d97e7ae47a0091b33801d9faab52535e9f2da407c14f3a9d39a4e85092
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests the document is part of a link farm designed to exploit search engine rankings or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=things+to+make+in+minecraft+creative PDF link annotation
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/be124439de5205f54592d9bb3ef68d09/72655913623.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210905075151.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/52972932565.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/nartqtaoid8d357md3p4978du1/64910891588.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/63955304880.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/jewamujoxasawodojijilevov.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/72d644489988bb06f0853ebe95fa5a3d/48827591274.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/mekojuzuwovilodiravufam.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/lifulefudavetalelimosel.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/xofivowu.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/98085217468.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/xetifoleberozuzijedujepis.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-12/20210912182605535441.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/61888171771.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210910_21D8601DDD9DA327.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/25655624075.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/71443740866.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/8771227150.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/xitotusefebipok.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210919_F0331AC7F2275DDE.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/manubojejinivumareko.pdfIn PDF document text
    • http://geasit.it/userfiles/files/61884821387.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/movokowikavowokakesutejuv.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_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 17052 bytes
SHA-256: 04a980d4256539e7baeafbbb0701d40f8f2ca16f0cbf454c0605572ff40672c2
font_01_sfnt_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 10860 bytes
SHA-256: f3d7029ec15f3ebb11dcd252a5b935176a8df4797146ad5e591b78bee299dfeb

Open this report in the interactive analyzer, or submit your own file for analysis.