Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f04fb5e410063a7…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 20:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d334e279d2db9fb89dbf5bd59f14d46c SHA-1: 5cbfe86c70593d7e3a37e7aa73e6933f088ee771 SHA-256: 8f04fb5e410063a7b664735c5667908c052cb74b5c99ffb3f343cc5a0d66a57a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://builderall.info/userfiles/file/gogovosodugosemedas.pdf In PDF document text
    • http://studiotrusso.it/userfiles/files/jikoruxarazenip.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/82523586314.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/mowikuv.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/bipekalarezefowiveki.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/jijalalezavizamaxo.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/83035038887.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8caeedaff33fa6c9eb14fd66b26b3be1/tawerolajagewogevidik.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/42379156000.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/8152861687.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3c439d92dafe459adac28555f0df5d5b/71458350205.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/16447870952.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/nibikef.pdfIn PDF document text
    • http://lgassociates.in/uploads/51384228098.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135027bd352f---duwevesuluwemibabul.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/78584357018.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/94172806745.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/59865752530.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/40714381288.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/7942845091.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/webeziresomupusizipesa.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/xefavizapirebipifukogo.pdfIn PDF document text
    • https://nomortiga.com/contents/files/34681539028.pdfIn PDF document text
    • http://lg-palette.com/upload/files/35800840266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=guidagenda+gaia+pdf+2PDF 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_off0000d04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 10400 bytes
SHA-256: a1700c3d510e598483e8f77183b32caa5f109a3600f53fde8d8c9869063bb550
font_02_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 18380 bytes
SHA-256: 731dbcfaeb9acbe9a4824c89f80ce77021af1b9e7c30b1af478ccd184c126744

Open this report in the interactive analyzer, or submit your own file for analysis.