Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb15a1a8a36a733…

MALICIOUS

PDF

98.0 KB Created: 2021-09-09 16:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b1b08d6bd54f715876ff7501e2dc289 SHA-1: 091c3b5737b0b4e1fd6415eb108ba5d6895e8e7d SHA-256: ecb15a1a8a36a73332bcf9dad7a6510acec91761a8da60c39cc04d8993e9298f
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely attempts to trick the user into installing a fake browser update or extension. The numerous embedded URLs point to various domains, many of which appear to be part of link farms or compromised sites, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://laborke.ru/uplcv?utm_term=barra+preferiti+chrome+android PDF link annotation
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/51648960561.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/89660778096.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161346c89afb95---vetefoked.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/29184432141.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/jinevorinupebelodar.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/31740860354.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/58444743829.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pj88tblirh2hinj52bp3q1egb6/wiritavofuzorodazoze.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c50c2cf9d---24175218942.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/30132883100.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/tuwinulotepi.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/4918138253.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/gurunuvepegenoriji.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/zaxexekolari.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/16637531459.pdfIn PDF document text
    • https://thepainter.asia/upload/files/gosukumefexavetejitopa.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/navenitopowowiwugapiwav.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/48429485232.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/76573209848.pdfIn PDF document text
    • http://rubensova16.cz/files/file/bekerisuzelozuno.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/gavadepa.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/zolokakemukopodu.pdfIn PDF document text
    • http://egitara.com/upfiles/files/50624327839.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210909052611.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/rebiwafijuwup.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_off00011681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E98 10724 bytes
SHA-256: f82b5d5ac467c702c312d48de856e96e4711357e4397346abb5a6162e975d8ab
font_02_sfnt_off00014705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14705 19676 bytes
SHA-256: 00aeb2e0f0e31d04def4e9309cc32d0c0c521adacef35ba3e0c5a5f634c3085e

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