Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88666420f2daa3f…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 06:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2e0e7bfdbd6299511e99a003e1cc76ee SHA-1: 677c9708d3003df806c71edcd5d77111fb286d58 SHA-256: c88666420f2daa3f51b8d917a74b3970d1054f59ee354f8fe1e8735f3ae748a8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the ML detection indicate a high likelihood of exploitation or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://brs.jo/userfiles/files/nijapomafifo.pdf In PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/4854897643.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/toxifebowujopu.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/56119617721.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1614126ee09e02---riwadutonemuvez.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1eb5d8c50---75599794633.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/55833610647.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/57527789999.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/pobikixumenesidavasav.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/74199349776.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/dabonuwa.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hpbc43khgmujgf2ui9polrigfr/posas.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/62363031950.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614139fcbf3fe---71250797586.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8289ca0c---43919095419.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/54926885186.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/30400298450.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/wuwemofaxagujetunolutona.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/26835577155.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/27383732934.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/44879910155.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/molutawu.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/90257a37a1f4c293377c627180817523/82153651272.pdfIn PDF document text
    • http://ucokampen.com/media/files/fowaputoxapamuke.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/35648771479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=c%C3%A1ch+g%E1%BB%A1+c%C3%A0i+%C4%91%E1%BA%B7t+tr%C3%AAn+androidPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 11580 bytes
SHA-256: af0736a386c27aa6eb98ed8b2e04c4d7f3b1d522887e6123e06557265019b5d3
font_02_sfnt_off0001045f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 28084 bytes
SHA-256: 28824ad77460caac861d5a37eb60aaf084d0780c0be8bab45c4722de9914de82

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