Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe873434fe3d55e…

MALICIOUS

PDF

76.1 KB Created: 2021-09-15 17:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d5ded78674b18039337286fc1bcd7ec4 SHA-1: f1f77e371554226d253ee266ae0938052f01ae5b SHA-256: 8fe873434fe3d55eba5732dc4adab3640fab21a2f9b2e2335bcfa9ca6c21ff9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=download+free+fire+game+under+50mb+cobra PDF link annotation
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49842044736.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd871638a---15440697483.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/76029641986.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/jovatuxoxisaxuzusev.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/zusuporupekelo.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/bitetozofin.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/tafera.pdfIn PDF document text
    • https://emenu.hu/editor_up/9848559554.pdfIn PDF document text
    • http://acril.ru/ufiles/files/jedajexesulebafelilixike.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/rawabuwixifipu.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/93633575151.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0d0c03d3121388d21584bced7e60f52a/dufomakole.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/19920806737.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/65485969441.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/smpud19m9mk859sp6ovlsgt8er/kabixexinatif.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/6758718610.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/lilexujiziviranadetajixu.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/fanonodadibesajipe.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-2/20210902093128496131.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/jelojolunusowufu.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/sesuzazixazetamifabi.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327124037e2---wolixatakunigikopexo.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/94949874572.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/dobalirofinozi.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210914/16316175637047.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_off0000bf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9B 11136 bytes
SHA-256: 4c50da6bb69a6dd83d9263b7e7d12d6b76abd4673f490f2edad3968d98174eac
font_01_sfnt_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 18652 bytes
SHA-256: b0275cb7144fdae70699e80f2dfa74d1f911ad29a9cd3919f2701a15727a3497
font_02_sfnt_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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