Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1658b79b56d7ca…

MALICIOUS

PDF

75.7 KB Created: 2021-09-25 03:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0f03c0a26492afeaceeaa52a1bfc0a3 SHA-1: 3ce5d60aacd72d37bd88f6c74f82c9d1b7b8a7cf SHA-256: ce1658b79b56d7ca7b2ce4a19812e274c92b37d6c0fc10d8b594932597bf34ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=convert+video+to+mp3+android+programmatically PDF link annotation
    • http://auto-spec.ca/fck/file/94240268889.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/wolivadisotugi.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/qvg7efe6a8kv2sgtvhvqqg44hk/dagobimuterez.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9d1a2e8940d71bdcc8a1830d4b71743b/tutajivililavofa.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/fabinerited.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/popewipoxitodavomuz.pdfIn PDF document text
    • https://petribax.com/userfiles/file/lajekazuruzipewobawab.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/1776663547.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/sufetikizoleg.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/suwiwapatinebilesovatediv.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/82754389028.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161423be3dc6b3---muzevijad.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/fujipofiwolutu.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/62777171171.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/46838145782.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/widezonogusajorosode.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/13638413235.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/99810148723.pdfIn PDF document text
    • http://www.bash.cl/media/file/6774696680.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/65916127780.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ssm1tug56kr6g5o3h1jqcu3p35/muzuxaga.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/vukujanulebokas.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/41931279407.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_off0000bd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD67 11072 bytes
SHA-256: 1ce030e1414bdf3553ca03154f08a4429069a477b496f386ec89be8e39b49f44
font_01_sfnt_off0000d707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 19072 bytes
SHA-256: a10315db4cac48c2f21667323baebf036faf747d67d2ff3adc8963eb2714abfb
font_02_sfnt_off000108df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1