Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73b9e6144300ed6…

MALICIOUS

PDF

85.9 KB Created: 2021-07-27 13:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 56d03f73f080750bf56ada476d03cbed SHA-1: 0bbcda36c02e4aa5fd3d469cfba2c7c6522dc333 SHA-256: c73b9e6144300ed674545e851460361f014fade7de0fd51a36e7d4a83c2fa9fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/310e245f528369b70997f2aca1aefda4/zitenu.pdf In PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/zadokabonosobix.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/lunebumuroguparoz.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/50520628272.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/9c3ad4269de4a87c4ddfdbcfade72a23/zubiwazejolinebi.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/42872268542.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/vajewiputugixet.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/23497156937.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/q3vidnnqbunqa3e7pjtje5kna7/9067348769.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/lovenamida.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072277079134---vivisenukusoxo.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/e35443d4ed84378ec6ea4dceab321053/zabakowidodopametisa.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/wuvaloxewexunikebalipo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/c6ppteek4ajsdb690qekjl9q44/30755646759.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/paluboteliserevi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ce7a75708c7f23776667bc4838a95d98/riladafonoje.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/55295007938.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/52966900996.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/59344581073.pdfIn PDF document text
    • http://wakarusavalley.org/userfiles/file/gopiwij.pdfIn PDF document text
    • https://mfdesign.hu/files/file/zujuwipozonatelove.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/54536119321.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/72102870299.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0744e6a3c---puvabas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=it%27s+raining+tacos+roblox+sound+idPDF 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_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 19672 bytes
SHA-256: 14ccfcf85e53e4cd95cc933a22b7309742deee1f772e3029ded7346b9946dfbc
font_01_sfnt_off000117f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 10740 bytes
SHA-256: 33a30b948f9ae8f184d29712a4eb8435efa988a0fe1f2a7fcd260a9f31cb8264
font_02_sfnt_off000130a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1