Malicious PDF — malware analysis report

Static analysis result for SHA-256 708d999548b42aa8…

MALICIOUS

PDF

75.0 KB Created: 2021-09-04 17:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc9ac8f8c3e69d181bd27699acd191a4 SHA-1: 691e0adbdc23b42c6919131b6b08c6ef9da8b7fb SHA-256: 708d999548b42aa8c230905d75f54c7666f5624e7a7a7df0ae7fa4b519b64f65
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous links to other PDFs hosted on compromised websites. These links likely serve to redirect users to phishing pages or download further malicious content, contributing to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/fa67caf0d9ffff5674d852c188824768/39337502112.pdf In PDF document text
    • https://traffictkt.com/viking1/uploads/files/kokonesipuwag.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210902040326899.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/htkgr3r1gvv5nkqq5jr37ha0f8/21138964346.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1b16816351af0ea487850cf97c851efa/demof.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/tijukurikewenutowebu.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e72c64490ea0b7d55ccc24c2e225edc6/tezofabujanoxakorixes.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c70ababc---51935165216.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/26db9699cc67effdbaa2c25feadbeef1/40560420697.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rhiarrjailacimb4gde9lc29st/8551178601.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/joterod.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210625094141927.pdfIn PDF document text
    • http://pagodatalk.com/_UploadFile/Images/file/kovufidomazisajogugamex.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/31510228666.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16084c2c2f135b---xiremusoku.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/oislsvpkpaplkvbgcair2m9i83/50545827290.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/robawovefalowa.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/nekizomonowulitazanawevot.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/mememezobe.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9c1d805cb---29533875648.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f30d1c308e---67588226925.pdfIn PDF document text
    • https://oferta.lt/i/File/16767471597.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/jnqe389n602m3lmb384vcddsp7/fotafipobugulozife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=phaseolus+vulgaris+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_off0000c088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC088 18320 bytes
SHA-256: ec781426129d8c19dc5dc724f6e215a4da516938f2d67a5653550379898e587e
font_01_sfnt_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 10740 bytes
SHA-256: 4b83319baa4fe0097fc37cf4ed639ff4d295ea29b0d86a93f72c7e08ddac42f3
font_02_sfnt_off00010713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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