Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d31d2d26ff3ca82…

MALICIOUS

PDF

85.0 KB Created: 2021-08-16 09:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 613fc711494bbb2f6fa02aa01cb5d4a3 SHA-1: 4b16ddfad557526214393df2b4f5438d35057061 SHA-256: 8d31d2d26ff3ca82fb905c0d46f6dff15c961781fd6131eda0943da21317ad04
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The document employs social engineering lures, specifically prompting the user to install a browser update or extension, and instructing them to copy/paste content into a command-line interface, likely to execute a malicious payload. Numerous URLs pointing to potentially compromised or disposable hosting were extracted, suggesting a distribution network for further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://5mal4.de/moneyvidya/web/images/userfiles/file/nuruviwanugoduf.pdf In PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/pezibivatimidotatefid.pdfIn PDF document text
    • http://willbramephotography.com/38687350526.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/uqh9tmao3m08qe55uddf4sh7gu/kapadawa.pdfIn PDF document text
    • http://poorclarescork.ie/images/tudaweratabozigazerixad.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a5cf298a3---wexazow.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/46265052962.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f482083261---nexosaravoli.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608639b22af34---zusupagogiduxegoxijuve.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210530_016003EDD21B9BB0.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/118833e77b47e19ddbee27fa5d994c05/15249309765.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/76686181653.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/6562085882.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rn2egejgfemee2v69j2gk34l53/sajazi.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/36244374926.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/vonopefig.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/gapimegisexofasikozezir.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/95c20a744352298452c453da9a9493d9/vizewagiwojuxofu.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/72118775792.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/3c521777317ed235d2726ec59515b471/rijurixeburazunuvatuke.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c1d66e23e3505eddf0f78719fb674ce3/xigudadideduvumewanopiw.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/0a471530a33100e2bfe3837d336e78a4/mezabozivovaraxaxujew.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/59185307654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=widevine+content+decryption+module+firefox+linux+installPDF 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_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 11156 bytes
SHA-256: 82957b796adcb6cdc838490fef92a6e3c5f06bedf98f30405097b79a077c4cad
font_01_sfnt_off0000ff39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF39 17496 bytes
SHA-256: e31ec90359dd7688298c7375ef146b0cacb17c7570187a887abf6dfbcb4856b3
font_02_sfnt_off00012d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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