Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9ce652a0f9bcd2…

MALICIOUS

PDF

134.4 KB Created: 2021-07-01 23:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0608dfbcbe1036e120aab04f8b6eb390 SHA-1: 4196ae9aed58bdb9d074bc321c6877c2d5e67fc3 SHA-256: ce9ce652a0f9bcd261de372b3fcad45fb24987513a87860a9bb5921ebf3a06ce
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and compromised CMS upload links suggests a tactic to obscure the ultimate destination or leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://chcial.ru/uplcv?utm_term=chaplain+in+army PDF link annotation
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713be1b77a5---rozodug.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839099abd48---wobafenuxosul.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915266d1863---nonawifalukulonirubepemu.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e26759eddb---josogasuniwukunekugilog.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800ccdf39ae---kixotido.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/fudolosowa.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/e5da76107a89870b0f88509a4baf7b4a/94907680110.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/maratej.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/cc35327f350d5a49ce18325fe00b5448/robazoronosik.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/tuvalanobozasij.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d70e2891c3314a3e42d3e7e5f985c480/besod.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1ce2dbb1---tibozilazewitekapazave.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607132b86b222---jovepuxevaf.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f45b3df10---powisal.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/87288985888.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/17006098524.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/sigewivizavuko.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/fiwonobuvipazoperiwak.pdfIn PDF document text
    • http://jaatkinson.com/userimages/15443034221.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e3846e3071dd35d090de53bcd8043895/45534142922.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9252abb0b---rixabamow.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ea78317df7802dce983f9113fa2e1b9d/zovirekeded.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/722cd87a4a459062ab27a395679a39a1/15111483048.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_off0001a4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4EA 22976 bytes
SHA-256: e9df2882902eb776b0f60dbfe34a24a575d2e11588967d42b7f7cc0088c82b6f
font_01_sfnt_off0001dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5BE 10144 bytes
SHA-256: a8ca138ba9f84e8279b590ffd9d7e3501a0936c7f56c6725ed74e9b709cc59b2

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