Malicious PDF — malware analysis report

Static analysis result for SHA-256 07833f6ece66072b…

MALICIOUS

PDF

85.9 KB Created: 2021-08-21 11:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c102274741b3ec1358eba7848e9b32cf SHA-1: d53789344e662c886e19349743b26bb0827b0794 SHA-256: 07833f6ece66072bc5e883d0a08d08d7185d6f905be33ae2539b083b69393528
196 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to interact with the clipboard in a way that facilitates command execution. The presence of multiple PDF links pointing to potentially compromised CMS upload storage and disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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
  • 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://amdind.com/userfiles/file/93976249301.pdf In PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d2e4e4def---kikizafajusugepofap.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16110e0aece58d---83585517533.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071f86c6e975---81667248582.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b76a3ac4---67911383276.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210812084438.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/89779096.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/99789079360.pdfIn PDF document text
    • https://serka.com/serka/upload/files/26826863552.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/16036415022.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/tr4i7i92udchslq30nkn39phl0/54093400217.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/41259296078.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e42eeb109d26a12efbb62028c44dd7be/11245464822.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107242255132909.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b54beccde---mosemumek.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc8b023d9---podibef.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/wipinaje.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/sopejobidigazu.pdfIn PDF document text
    • https://termoformat.md/img/files/26725840019.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/afd05193f72c0bebc8f5a68cf04b72fa/zolagaluk.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/xotewezizota.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/vedamadur.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/nudubisalode.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/jividar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=final+destination+5+full+movie+in+hindi+free+download+filmywapPDF 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_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 17888 bytes
SHA-256: e963402d5f7e29cd0196235d0670f777e9c904ed4b9a35d20ff1b6eaab00debe
font_01_sfnt_off0001166d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166D 11240 bytes
SHA-256: a87183c38c90fdd32dc58b692a1330833c2ba60b02d47d391e7dae0bcd9983b8
font_02_sfnt_off000130aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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