Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f9898f409ac7b3…

MALICIOUS

PDF

87.9 KB Created: 2021-06-30 00:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6df0b6b9a6728ecd7ac2ab9d90ef252f SHA-1: e68abf5d41a28107ad997e912c533b477c6e4d9c SHA-256: e6f9898f409ac7b36ab4815bf9de1e6796513124e93a9a66e4b9267b9b54703d
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc447b02b3---tasozare.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e14c766712778ac0c8f72f36c5c62186/81929289267.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608447440d600---54869192459.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/88a0a3132691d009ce9944d4f00c6ccb/nukunekejifokubewinura.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a566d26d---xutemipijolibonelevila.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/cab38940ae02e4483965d5de5f1a01a6/51771009180.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/jimetabit.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/24034320984.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/2a5104909fcc83b097304b6573802af0/siketuviwakokav.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d306d556ed9---gabogebo.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26ec861ecf---8810928961.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/11j1pb9hfdo17qd14jp8aq4nq3/69385810810.pdfIn PDF document text
    • https://samudra99.com/contents//files/52556221986.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/18313463297.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d55320c7e33---faxalox.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/0uku1nrcp61fsbklrsbdbrvsls/78231353921.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/kn0or3foji82in3ej58q7p1gi7/zeduliw.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072c931c13e3---wiwazapub.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/xajewenutotogipo.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822fc0edb4b---pubuvasumaxorufegonebef.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/guzosiwiruvoreratefe.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a7996bebcb1f64161dbe3dbd37a36c47/78907872627.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9tmji2nd1ak9if5ncqrr564uv6/92521478027.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/neletisuta.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/wogomezumafewukinadowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mehndi+designs+2020+new+style+simple+photoPDF 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_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 16736 bytes
SHA-256: efb3f9a2d9b82af0ee51b1735098a8dfd8b6a1c2e1e7f0e6068aff0b2d632764
font_01_sfnt_off00011ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF1 11012 bytes
SHA-256: 48978b8960d30735a9579d64bcf0c77b22cdb6fbc9fa6d5a63aed0334bb04c83
font_02_sfnt_off0001383a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1