Malicious PDF — malware analysis report

Static analysis result for SHA-256 16858a194d2fc3fe…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 16:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 715730acde1c95199ed8d8688c547e12 SHA-1: 1aa7d5ec59234b753507f0832d7a7f58deafa6bb SHA-256: 16858a194d2fc3fe2b555b265e475f5ab89e1954449a6710f7dde4d803a4a044
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The embedded JavaScript and the 'Clipboard command execution lure' heuristic indicate that the document likely attempts to trick the user into executing commands, possibly to download and run a second-stage payload. The presence of numerous external links, some pointing to compromised CMS uploads, further supports a phishing or malicious download campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stancijanegrin.com/userfiles/file/5140768660.pdf In PDF document text
    • https://szabolcsipeter.com/userfiles/file/pefopekiwebodigukuditunis.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/gerul.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210903_065904.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/jixefawunorosujasugunukik.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae6675211---93335451324.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/nowuwefanob.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/lupisaputawudoga.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/bexafiromo.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16144bb68c0d89---10294668825.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/zapibiju.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/zenemugelonarufuro.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/88147105431.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/41391581487.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/50425467348.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/53098759755.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/39905311540.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210918file///32731429788.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/rakopubemujebanetunu.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/vuruvamunibebejusekit.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba2175ae8---13684476575.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/jenuwa.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f305d702850431f617a6562b9724acf6/wopazofofirezarelanirera.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/werozapavilerodirumorewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mi+phone+deleted+photo+recoveryPDF link annotation
    • 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_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 18720 bytes
SHA-256: e079f241754af80715dc537f609e55c6946a46379979165f87e7c21629add8a8
font_02_sfnt_off00012e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4B 10456 bytes
SHA-256: 029b8289a13a884f624f3b4a6212454bed5e9686abef0ac055a245dcf365dfe2

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