Malicious PDF — malware analysis report

Static analysis result for SHA-256 777df55897cedce8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 17:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9e7179f72e9bef29e8979d465edc2ac SHA-1: 8988ab1cbf723b9f962c92911f724d654d4e12b0 SHA-256: 777df55897cedce8c98eedb6905e399d3a587ff73daf15b7c9b44d7ffb70acc3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains a link farm pointing to multiple disposable domains and compromised WordPress uploads, suggesting an attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bestofbucerias.com/upload/file/79606412813.pdf In PDF document text
    • https://debo-fit.be/userfiles/file///89024181771.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac057a2c35---99966899427.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fecf90fbb---1553281924.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab01420cb6---xirimezorewabumugiv.pdfIn PDF document text
    • https://protrialse.eu/files/files/kitirolipuvowutixerademiw.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/vukupexona.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/3619562999.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea1fe0e11---51655714135.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///15072978540.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/66236649423.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/kujadozopolozajabox.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161371d87dbc66---lavakaji.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/sogonanomuxobadobomaz.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/76245955215.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/vojofanuresan.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/91086556657.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/newulefulivezomunixosebeg.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/84993100912.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/84923237247.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/21dcb03c0ab55748047aecc12438c229/82371221422.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/ripiwokanet.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kk8shkdtfpi1fh77bgittc0vpf/lokelavaxurot.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/96165670265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=beyblade+burst+spryzen+qr+codePDF 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_off0000cb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5D 17592 bytes
SHA-256: 7456a755ac7e817d33f6e914b847a674c6deeed68e2451becbf9c5144216b840
font_01_sfnt_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 11028 bytes
SHA-256: 442d3b6889232232081ab71bc6e365269fa78a0847a9baaef2133c4c93172c9c
font_02_sfnt_off0001126e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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