Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f96daa362721b9…

MALICIOUS

PDF

87.6 KB Created: 2021-07-03 00:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 05c49185a0cd701c6f4cc770c636d308 SHA-1: a29eeaef7254ac5dfb1bb83d6921c4cd50e9bc06 SHA-256: 94f96daa362721b96cb9dd27632c3bdd413cd2c2d6e47a14f6a8b052a87ce02c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV both strongly indicate maliciousness, consistent with a phishing or redirection scheme. The presence of a link farm on potentially compromised hosting suggests an attempt to distribute malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://woori-tour.kr/FileData/ckfinder/files/20210612_487C13E6CE217BB4.pdf In PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/fngneni1mdrrcpeti7orp4bt80/20710294856.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a34ccd60f60---40586056130.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8d98ad0d0ede798ae795da25a9ddae03/tususediva.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a63abfdc5230f0878e6adefd7d8d9f09/12801681458.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b49c3ce657653ff45664034ddbbb56eb/28595621703.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8354dbc3f2507da3b1bfbf23d98d30c4/ropavusazatolapu.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/016e8e3ad16061b9ace0b49a3af487bf/72598071595.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f13fde625fba2b14093969fd10689221/povopogemapizifizojer.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609894ec2948f---40657310814.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/vsboacermaig5ceci0kqifg68e/todabonifenobodavotolot.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d34d677a0---vajedin.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfa5a1cdb1---setepogaponitalaxotuv.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607118acb289b---sukekoxi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad58d6c8e8---11518072652.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160738ec4383a3---8876235105.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/rejadusakejebixukav.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/47d89fce952a777494843b78957655b1/77352899165.pdfIn PDF document text
    • https://paperland.bg/uploads/file/32583631090.pdfIn PDF document text
    • https://aashianarealty.com/file/94969977700.pdfIn PDF document text
    • https://badoza.net/userfiles/file/gasewerud.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/23723093083.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vimexikofaxidolotelim.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/8279174e03af71fa2e00250ac88e5eeb/45570040174.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e5894f5d2ed67cb797b966caf9d865c9/21531353923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=four+pictures+one+word+dailyPDF 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_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 16544 bytes
SHA-256: e99b8dd3a1b3e1e0c79b1a43bd8b959f322125ca921748935f3e6e93d1bb416f
font_01_sfnt_off00012023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001383a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383A 10784 bytes
SHA-256: 3b30395785dc10b8240a800ffe229456dd0cb904c70f05c33b4ca3afff7ac9df

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