Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c771ed3847a7d1e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 17:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad8c0987e355affc9c0b68d4c0571d2b SHA-1: eb63b3a02cff4e9ecada0e4bd4c0b37cbddd2de5 SHA-256: 7c771ed3847a7d1e5fbf51444f056f4beec9cb19a5bd7cc427d8fc66d9c6d298
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software, a common social engineering tactic. Several external URLs were extracted, including one pointing to a compromised WordPress upload, suggesting a potential distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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 https://chcial.ru/uplcv?utm_term=facebook+2014+apk PDF link annotation
    • http://ttc-investco.com/img/files/2206957599.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/nupitoxuzuxo.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/puzixijojuwal.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/nibojimesubar.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/27101516079.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/5106844998.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/rabumexafelobaka.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/79825190098.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/gukofenovubatesunefuxa.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/6r45a7tsrij1cnrkkavsaro0p3/11811695488.pdfIn PDF document text
    • http://homeopathyhk.com/files/35336397508.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161368443d979c---tekifurofixidado.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/6sh4p3cs61tce2uicri85roloc/49049051519.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/figumasavuboz.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/pabavejibokujabum.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/53354497634.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/jofepivapam.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4ede0983b---taduzigelovobu.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/govuguxeni.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/zolewaniza.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/96719679773.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_off0000dde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 18360 bytes
SHA-256: b41f7b37557c399ec5222182df8c6afd96b4082cfd3b89a2c8a41454de2be1cc
font_02_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 10340 bytes
SHA-256: e88b10e16b85cb644c1293a6dd7824e2c71c641d141fd3065ab326a73f03b023

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