Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca3eb10bcca5a43…

MALICIOUS

PDF

78.2 KB Created: 2021-09-22 12:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 568a08faed63a5a076d51cb5afb8491b SHA-1: 5a96da5037875da71283ec2bc34cf067f288ed41 SHA-256: eca3eb10bcca5a43b585b77b1e00518ce0be1517ad0ed28132b69a5c076f2fd5
216 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a link farm strategy, with several URLs pointing to compromised CMS uploads and disposable hosting. The document's primary lure is to trick the user into installing a browser extension or update, a common tactic for credential theft or malware installation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://repare-ton-smartphone.com/userfiles/file/52937815764.pdf In PDF document text
    • https://babamansurkurhuseyin.com/uni/yuklemeler/file/zivenikizofubekalirinof.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/titozatazedig.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/15350073712.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/92167140792.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f40b0926d4b652abc4a894b70b8c8092/23507064585.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/4p4pio3v4s6sjf1712c2p94h9n/58836427424.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/vujamobagugemorekosa.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/setovafivubelu.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/jutumololi.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/91446667787.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/2483356116.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1edd2c94---wekenasagomodufikiwuzema.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/femov.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/3108525114.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/11eb0c8cdf147900a03d21b648a276a7/perunidumu.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/31994831910.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/kinaletolukilopiluzom.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/pujajepozexorabubovi.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/vesomof.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16319764276829.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/72153159772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+scan+url+on+iphonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000d45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45E 17940 bytes
SHA-256: b3d365cae3aad1024da6383135a007eb52eb99360a98748319f637e26c3fbbcf
font_01_sfnt_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 10648 bytes
SHA-256: d015d4c93a740634a8d6d829a2fd50eb6370327c4fb0c9f45b422a4ba0961af1
font_02_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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