Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f615b7e75a7644…

MALICIOUS

PDF

74.4 KB Created: 2021-09-01 20:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ffcbf4ebcd92ecc8d9ae5106bc5dad2b SHA-1: 84234570553263190ff89db8d186494859274b47 SHA-256: 25f615b7e75a7644a5ed2c96544a888384c365e170cda3bd02fc336c0ddf244d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=happy+birthday+template+premiere+pro+free PDF link annotation
    • http://alnadaoil.com/userfiles/file/taxazagupoduwavidulagus.pdfIn PDF document text
    • http://vaithun.net/upload/files/17553099858.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/raposulubuduzopuzuxoxo.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/fa218b67d994cd836dd461ef683f8124/kupasererulamisudizirevu.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/fafete.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f005670292---mekimakaketut.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/5348a29db106cedf21d8d02715a299c9/sazanupabilupoxavopib.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/754ac4be3a3fa6297c9a5b9c5302d2eb/mekelarov.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca6a960752---50542785122.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/68219733680.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/siwemod.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c89a4314116---27831691390.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/lisetorezuvijikop.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/44997777318.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/labatafekixigovufo.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/sikeredatifuwizuzug.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adfa983342---natugotevomupeje.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/4htqb384h7irnrp2ev4gp0p4k4/3665523717.pdfIn PDF document text
    • http://wwstationery.com/files/file/92016903420.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/xeperolubiwolexenevap.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/0d7a114dba3b28b85aba3b819b3cf0cd/87362220724.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/74523379701.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/simimuwejaxitisudexuziliz.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b46c0e1dd---27353729647.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/xuzazodule.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3ad7fbbd14b639d8f12888120e2ce3ce/jubopope.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_off0000c066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 16828 bytes
SHA-256: 9dc35042bb9101a5bc7a2a12e97a3aae87768cb56aa99a885620e92ce3c0b4e9
font_02_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 10736 bytes
SHA-256: 304c67bf7a6d7e032c1385884a7bcb524a8a0a470e9d0daa198ca143f4552835