Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67ad8916d8e3fdc…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 05:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8c8711f1f6c6d8e9dec17be1e8b79c1 SHA-1: 34578edb4bcb820240cad038ffdb609f98b3f0cb SHA-256: e67ad8916d8e3fdcb8add398f832cb97dc17f3a378b9941ea88f899f69d000bc
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=free+v+bucks+redeem+codes+2020 PDF link annotation
    • http://ellissi.org/userfiles/files/71163445231.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/53234455368.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142911798548---doxupuwudefiwenene.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/92160124420.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359b1199d4f---pibiberolovus.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/nekagitu.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/60812722793.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/51434623373.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/kazisidalapunit.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091121544932.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/36503664669.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/wibezezemewixawubaz.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/vaseliziruvumosipo.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/lupadovizagugexinimim.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/23170474320.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/11133099152.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210914_5C6348298742851D.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/40229527938.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/90430174601.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430f24874bb---69478755089.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161395502c7297---buzuxur.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed88dc7d46---ginam.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/womixukewed.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/wexugumos.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_off0000b47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47C 10648 bytes
SHA-256: 0fda518b45e5cfaeb2d510dea6c1b1e55131887d15d258b7c2c23dcb5de5fecb
font_01_sfnt_off0000ccf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 16516 bytes
SHA-256: 09255c82b9c2b8010cc71c7af6f32fa8164b6dcf38478f3cee89ce0c22d8a951

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