Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0baa6ac815e6213…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 12:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c626730c825df90c46c6d197731e25e SHA-1: 533daac6004d3f7c0c6b278311d5488750ed6a93 SHA-256: c0baa6ac815e62134bfb6d58ab1a42dea37f5da1037fb26e563d2d350cb88330
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including an image-only design and a click-outward action pointing to external URLs. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://archism.ru/uplcv?utm_term=alien+covenant+torrent PDF link annotation
    • http://wcsps.com.tw/ckfinder/userfiles/files/51957195266.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/a7pmdje029nhv8gfs3imalp47d/kagikekuneboviwitizewog.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/difuregele.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/xabodofuxizolexokopurat.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/rokoxerojovutijoxiwisanoj.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/mezetugeturaparekizi.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb510d374d---73637172944.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/mefogepusimulomum.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/84564818753.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/votafoworameruligaxibozap.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161490d3dd2da7---2220237044.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/78814927845.pdfIn PDF document text
    • http://wernitznigg.at/files/98802752823.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/vidonekulumikonedu.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/55719145129.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/78jjcrhqivq15rj68n4k6tns3d/18894369437.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0e3145c1092c1a401f43ea7893853c07/vokisinilidaxazokod.pdfIn PDF document text
    • https://tuyendung.tlipgroup.com/upload/images/files/pujogevagadowefufed.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/2317196163.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/daluxesinad.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/56776894069.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/37071986797.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/zutuf.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/daxowomufovopidanabu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/05e5o1ild6ghh4pm680792oi6i/metawelo.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_off0000b468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB468 14476 bytes
SHA-256: 4e964b97cd345af3cdf7761419106e480c27b941bd170703e820b53a29b13e46
font_01_sfnt_off0000d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 10100 bytes
SHA-256: df7e1580d19cb431779ce2683a5033eb414b55c23670330b5fe5acfc41c2ca06