Malicious PDF — malware analysis report

Static analysis result for SHA-256 932d9b4b2520e384…

MALICIOUS

PDF

88.5 KB Created: 2021-09-23 07:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c8c7ae32a11b33f6afeb39acec06bcda SHA-1: 562d2fd79330486cad1272fe9653df4bfca77413 SHA-256: 932d9b4b2520e3847e41677a8aa5f0f31ce3590f9d6cbd1819b8784f7b5025d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm intended to lure users to malicious content. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=top+sniper+games+for+android PDF link annotation
    • http://fine-cottage.ru/userfiles/file/44131508554.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f70150b3825cc11ae0063f5d9716ebdc/gonomawovesiz.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/maucqjj4jvfgi7ciou2rb1gtu6/roteneke.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/borokibajepanizowojuvobub.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/wuvemalolum.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/51667070014.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/44386117848.pdfIn PDF document text
    • http://byecook.com/ckupload/files/85229433564.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/59409794074.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/37772621663.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/66798083515.pdfIn PDF document text
    • http://perksys.com/userfiles/file/nebomug.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/fixutikonepirefudiliwizi.pdfIn PDF document text
    • https://esz.jp/img/editor/files/20209527249.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/10891421901.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/72340003177.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/manelolinu.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631330103.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161378740d8385---fezisiwewatoku.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/rikarupakezogulomojukev.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/16082741259.pdfIn PDF document text
    • https://medtek.vn/storage/file/25802088658.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/20292600323.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/rubodurelalivufanatiwajez.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_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F81 10660 bytes
SHA-256: dca57fb614a517e21ccf889451f15bf298c4e4511dcaa507fed2b78b0bba9bf3
font_02_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 17132 bytes
SHA-256: 0330de64d6ef9bf1c07792bde6f3da7e6916beb8e4eef0fc7b456f044d490769