Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8d527d94d11998…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 03:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b7c053871497e0d3a2286b81602059f SHA-1: d1f85cb2c205d8f169a713b3c4262613633e6bd0 SHA-256: ba8d527d94d11998a60e9132d29f3dbfe2c63fad58673098aca87e640e786c1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=english+pdf+for+beginners PDF link annotation
    • http://angelcabrera.com/FCKfiles/file/sugojalanakapazab.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/geramunigaxusimoriz.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/44884981789.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/xegozu.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/kirawanotox.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/kurirewatedexojifo.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/puzetorewixujogoraguwejan.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/10226120488.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/9be500a107fb901de93db06bdb5e3e7c/bedopegopuvuva.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987ad75db92---44794283438.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cbabd3b5eac---62535419901.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/9o5l0164krg747g039fqsb1nk6/53494367325.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161008deec9012---fitivupururemidenotutovuv.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/sajaminuremugikuzelo.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/vinojetolino.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d5001fd588b354789ead8d40afef0b6c/35332122618.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/timirej.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9689656011---jomiganisurupig.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/lupebalajereruvopevalone.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/kojotigewetujuv.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/befera.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/tipigozugizolibasexevaj.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/mupufafaseg.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/82529965922.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_off0000d981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 10640 bytes
SHA-256: 29b3c18f87fa83391bbcfb8c7469877a159705282abb55412cbdecdd7698a2ae
font_01_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 17904 bytes
SHA-256: dd91eb66504a7093c09a40044ed9473d09a3a6d6d8a2b8d13c8e19829491dfad
font_02_sfnt_off00011f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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