Malicious PDF — malware analysis report

Static analysis result for SHA-256 b133cb73e76e6776…

MALICIOUS

PDF

129.7 KB Created: 2021-07-21 04:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83158d79e01d5b9f4e91424dd26d5c0c SHA-1: ec481d7a8bdde3a018e77a407199c0d3bf8ca12e SHA-256: b133cb73e76e677615d539e8febf0b0c29aa1da4e4d6b3d91d2e4daea1727455
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, a common technique for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further payloads or engage in phishing. No scripts were extracted, but the structure and URL targets are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ffde90cf0---guduloxevusatovonoferupu.pdf In PDF document text
    • https://clickkedai.com/userfiles/file/95681065853.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a87e936a171---13408818970.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/de8de1b6d25f2f04144497297da6e678/kutipe.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead1001a97---monurowulewojekile.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/f69dda48e70bd64962b52c0e923cce76/xuwimeluxolirixejiludaju.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04a45a4c9e---jakafat.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/41516233622.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daf20d2f327---98037491206.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a79c9a2053---27379814330.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073755e1b327---21844735170.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1a173260e6ac5d0171337c37abe0c713/wivozokenuvusebufu.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/roxupiwazomap.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b157db61c9---parelexaz.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/89532820936.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/bixipipezefowujadaba.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/49307457040.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d242323a12b---zovonivokikimemivebuv.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2df8448d79---woragunadigo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843afd6ec6a---14736763736.pdfIn PDF document text
    • http://allycatering.com/userfiles/7796345554.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072d7cd67abc---rizerenidirinak.pdfIn PDF document text
    • https://t2sc.me/userfiles/pewuliwerisugu.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/79186473718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=roman+gods+names+and+meaningsPDF 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_off00019ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2E2 18136 bytes
SHA-256: 6f706efcc9c5403be863707f95f81f35f2d35f3747c581417da5057ada3fb94d
font_02_sfnt_off0001e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E1D0 10392 bytes
SHA-256: 316ef9b032230692e796a323d6a498f7173261db4a86c2c72492b0a7781a545b

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