Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbcf1adb75ebaa4…

MALICIOUS

PDF

71.6 KB Created: 2021-09-28 04:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 941140b68f4f27970531fbc190da4317 SHA-1: 75ab57772b409406c4dcdbaff096b8a5567ff7b4 SHA-256: cdbcf1adb75ebaa4aeb4218d7c410fe3ff89ffd9675db27f0355b3d3103f72f8
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=cool+pokemon+rom+hacks PDF link annotation
    • http://dungcucaytrong.com/images/files/ladij.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/72871868614.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/mifor.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/4489356643.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/17890541799.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/22325210792.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/buvuxitutasidinovofukojuw.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/jatexorexikukoberovita.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145f005217c4---menevepalonidedewik.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/rovonisiludapevex.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1630698794.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/zujidinuko.pdfIn PDF document text
    • http://fourfoods.com/images/files/98831920147.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/vijeg.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/zidanululu.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/teranukubujegulu.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/97693410627.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137237cd41bb---16733499557.pdfIn PDF document text
    • https://pecintajp.com/contents/files/59035742487.pdfIn PDF document text
    • https://premiersuli.hu/files/files/pinosovedokurojazafod.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/42432292977.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/maluxuziguzokopa.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1d6278d21---babadakezefog.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/mavopefotelilimu.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/lobili.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_off0000b37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37E 17296 bytes
SHA-256: fc666ce01d382c4d739c6f22df5f4a079f728cae05cfaa249976bc077198e700
font_01_sfnt_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 10572 bytes
SHA-256: 4186ece7aadb3382da463f9c1b960e3910a9c141c436a43a057659de654671e4

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