Malicious PDF — malware analysis report

Static analysis result for SHA-256 e116226b56166e4c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 13:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 574d16bb5d591bf1b28a8a59c79374cf SHA-1: f9406d65da50ad624557657a5ea12ea147276f0d SHA-256: e116226b56166e4cc0f295d6a1df182df44523d787471b5d73712e11d945fe65
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it uses a browser extension/update installation lure, a common social engineering tactic. Numerous URLs are present, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm used for distributing malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cructi.ru/uplcv?utm_term=how+to+add+chrome+shortcut+to+android PDF link annotation
    • http://studiotecnicomaglio.it/userfiles/files/vepava.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/86114402702.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/39669884706.pdfIn PDF document text
    • http://rococosofa.com/files/files/76043324464.pdfIn PDF document text
    • https://suksesunited.com/contents/files/92340097630.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/jiraxid.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/wogipofudadixo.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613628f2ca41c---ruturagipaxuzesisukiremo.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/54158990190.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613657358b4c4---nudugabezelafabo.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/7722025304.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/96155894856.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/15619287759.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/82897510926.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/74897205109.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fb5874df02952f84e5589d6ddddc12ee/40706145453.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/68782094207.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16db7dde5---96311046948.pdfIn PDF document text
    • http://dsraxys.com/uploads/7944793509.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/57469410085.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/tanatuwedukojivusumis.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc25c04dd---pufolokeminamenimelix.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_off0000d693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD693 10764 bytes
SHA-256: 92fdc82b0cd453cc44b88350e8a03101806df21873d144a37935ec910c35a17a
font_01_sfnt_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 17536 bytes
SHA-256: 5bee17e08e270d216bdf37b6b6f358c585b8e0efda0ae8ca6d01ddff3aab88b6
font_02_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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