Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2d1c06f853feab…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 13:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49a9d07de3a5fedcce9ddeacdc12db17 SHA-1: 21070d7bf9b4f61276c1b58343f707c68f782f0d SHA-256: ff2d1c06f853feab37a21ec4a10f737fa15d7d381ea0f3323419b2cdbb399300
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a link farm used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=stock+control+sheet+pdf PDF link annotation
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610f3f5795e6c---54439226213.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/25338729022.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/56999343186.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/e791de66ecd8e47ad958762ee306da07/73070279790.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/boloreru.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/48d3ca97f336ad21ac42640449fb8618/zejuge.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d2a935ac10d14eeba8d927941ce4f2c9/3554146574.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/65329948211.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/vanuroru.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/57177225519.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/jikobepiwatejubesapaw.pdfIn PDF document text
    • http://digifast.cz/userfiles/9831425491.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/35670951998.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/merulapozupolewan.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/dupisibejazebomij.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3af99d415be1ba61ade317e5ae35d417/funesixanasigalolosatuxir.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/fofisefagogeridovimikob.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cec5d3eea4---49262630084.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b5f805eee---5352408136.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/dusonokowolodolo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0511ce1c9c---wonamulirolepufatekugibu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09e5188ec---sirop.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_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 10632 bytes
SHA-256: 7d3d803ba9db4febd5632f35e0e14a8deb72bd732b853a460f4471b330f2a50b
font_02_sfnt_off00010944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 15736 bytes
SHA-256: 1b5ca2f3e1677bb90e0aff2ddfc77fcc33f9e025c5437e302f514cd6da221b36

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