Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2eb0ed3ac429ff4…

MALICIOUS

PDF

88.0 KB Created: 2021-08-03 07:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 7e8cc07fd96acb2243fae1f23196b0fc SHA-1: 6059b005418c6f3ee8eeddf4fd3b19e05b04ddb2 SHA-256: b2eb0ed3ac429ff4a152f45ad08cce2aa2e2010168c6cccc1800c0592a100265
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine rankings or distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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://hanboo.cn/Uploads/file/2021060922193070554.pdf In PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/ce4c8ed35d09e25da0fda0399a18a8c3/73574121375.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/92953882337.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/87285241337.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/79154770335.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/ae9ee3337c5015bbadb1020418126f9a/18269654672.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/limupinuzanoferagojam.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/bumokuvokojogeforip.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/tofikaso.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161061f3d994fd---pumesidakesi.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/miditolirenaruzawiw.pdfIn PDF document text
    • http://zuche0551.com/upload/file/17436046502.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/67018645054.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ij3ut8apne3fetdugvcspmg7e7/ratokapukuninez.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160959cec15c13---sumorujom.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc63de7337---61727431188.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/tidumalafomuve.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/pisezomo.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160949338196d3---60610528602.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089f963d0c74---84247547397.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4964be40---vejigodekotogid.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/73896824197.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9g4tm1tukbluef59bhgk29h115/gejalukale.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/31528419870.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aac78305c---devizekaxos.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f541309e6---guzexamuwobasut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=como+sacar+numeros+de+oxidacionPDF 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_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 10620 bytes
SHA-256: fc355205d45a2de827cf41b13f8a61e5e825f8202cb31baa0a7481b9d39c630c
font_01_sfnt_off000106ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 19184 bytes
SHA-256: 359c07476ed7996ddbcaa34c30d829d9a15a761a16f1a85e8a2d5f62d0e1bc52
font_02_sfnt_off00013815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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