Malicious PDF — malware analysis report

Static analysis result for SHA-256 176ba1f75a772405…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 22:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 621b46624879090ec8c3a0574243f570 SHA-1: 65b6560495683a2798faea86e0ff1ddb74ebf4c5 SHA-256: 176ba1f75a772405e62ff2ce17dae81a43481b92dd83676484502b849e88a3a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely leveraging techniques associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://glamweddingdesign.com/userfiles/file/35952159575.pdf In PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/00a433dfcff547453831ff756675e797/bozonamupobarazapumet.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/wokaruvijamegojorabiv.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec452f194c---55341496018.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/milanoxav.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/jomeluwepuzanefugezet.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/zalamu.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/maviberetelik.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/tovoramelimijuso.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/wemufavovew.pdfIn PDF document text
    • http://xzass.org/ckfinder/userfiles/files/mowagotilenedirejodezadu.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/9047895605.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/18ipkngcv4l4q2273ontrb6a42/togituzon.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/79927270228.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/54419420904.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/2969996902.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/fivobosorivi.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/rifoxevanizewabane.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/paniz.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/bazupob.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161346b312ca56---gorugajikovorobotuliwib.pdfIn PDF document text
    • http://schokozentrale.de/idata/91797688034.pdfIn PDF document text
    • https://wineart.online/userfiles/file/20252689744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=prepare+level+1+student%27s+book+pdfPDF 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_off0000d544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 17508 bytes
SHA-256: 76e9a84e7b1b356f40bc594266543eb3f67c993ad6495f26835c0fbd5d071933
font_01_sfnt_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 10884 bytes
SHA-256: a0b79a86314d92346c2c5d7358ffe830629314b1a567db22b4553745fb642a4f
font_02_sfnt_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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