Malicious PDF — malware analysis report

Static analysis result for SHA-256 f675bd98e0de1140…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 11:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae969fe3490173c2c88c2b2d53e8e8ae SHA-1: 0f1b887281727de6cfa225d0b60ff57ca05e9e6f SHA-256: f675bd98e0de1140ff3d5dae7c848fa8ea25d078f6eddabd31f2a3c21625f423
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 and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, web resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://careerroots.net/ckfinder/userfiles/files/22676506203.pdf In PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb72a8c170---sunotikodevun.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a4ddd96c7---torowovovifilipifa.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/pgonj6v5i9thmq0t1so82u1pte/kedagenewutukujukaxop.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/wofag.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/57913798152.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/651bcc37e8b15c753723e767c37420bd/demobiganitefime.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9f3ba80f2c0849342f45f1c88fdc2a9d/zikuf.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/57599152741.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/31126679614.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/63200361183.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/82908757947.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210623034859.pdfIn PDF document text
    • http://falerisztika.hu/tmp/jeripusasaxakum.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607386b9d20fb---fedufobidiwede.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/78488896235.pdfIn PDF document text
    • http://rc-modeller.se/images/file///98068619143.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b586682e680---morigal.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/nesob.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768fa1e2caa---34959107814.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/52264727914.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/49760219155.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160878123118cb---66351225835.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/5972d6faaad6a2dbe366779943b1be34/96166511928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+split+and+merge+apkPDF 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_off0000c36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36B 19720 bytes
SHA-256: ba2c17ada65a7945aba6bf200a621671c6343783b08900d65159d19e0ac763d4
font_01_sfnt_off0000f66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 10812 bytes
SHA-256: 6fc930e8e93e7a9e61543fe94a9515b67789416f988077a13ffa12059fe31c58
font_02_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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