Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46227c1319ca0ce…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 16:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a60b352412cb499db33dd95b5793692 SHA-1: 7f8f03e49c70b3977cd5e20ccc0553ff6e5dbb0f SHA-256: c46227c1319ca0ce7758f9be0f25280eaa8db3f3bdca441c04b6b340f358ab36
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://santeh.md/img/files/lonugogemalewofotumo.pdf In PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/30405255427.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161407097ac0dc---9658433282.pdfIn PDF document text
    • https://oasis-travel.ro/files/86174555578.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16144f32c6660b---xivedimuseg.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/fewuzolidubi.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/99894823043.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/97962959194.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/zuduvetutivigasobuwanunem.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/viposewuxisal.pdfIn PDF document text
    • https://kokomanis.com/contents/files/85216398436.pdfIn PDF document text
    • http://jsdarvin.com/files/55515186245.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614281a0e439e---nojetuzesapubepuwewu.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/pesewavisi.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/redulaxewopon.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16141e7da7ed97---rodirez.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/10556744536.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613090cd8002b---31207043929.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-11/20210911081732703553.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/64b84fa0ddd50283674b8b224b70b59c/58408928228.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/9125730644.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/tukofefiluzuz.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/pogemexofepepu.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/mudexipudajenatokowod.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/57879326883.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3fcb00b739178ebbd902ef5d1c116837/dikagin.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/50931516283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+save+data+from+broken+screen+phonePDF 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_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 11124 bytes
SHA-256: 926111a3cc9949c8d4a5f5c5c08eaaac6a3ec4a62cd89a0b53b001775a4f735d
font_01_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 17220 bytes
SHA-256: 3796ec88ff77f3fde6b1f2ef5bc4d7829ec4011166b9622a6f46f2e55b8de7ea
font_02_sfnt_off00011f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1