Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e15b31eeb20cb77…

MALICIOUS

PDF

70.1 KB Created: 2021-09-10 13:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2f8a18458d2817db14c28b1942337eb5 SHA-1: b1a75b7d71f813b94b1cc2ec3d840b7274fb7ecf SHA-256: 9e15b31eeb20cb77c2621412420bf4d7431fd037d86e1936aec10deaa4c60f93
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is identified as a phishing lure by heuristics, presenting an image that likely conceals clickable links. The document body is heavily obfuscated, but the presence of embedded JavaScript and numerous external URIs pointing to compromised CMS uploads suggests an attempt to redirect the user to malicious content or download a second-stage payload. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 8

  • 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 0 text block(s), carries a click-outward action, and is only 70 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.
  • 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://coretry.ru/uplcv?utm_term=bike+race+mod+apk+all+bikes PDF link annotation
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f82c2d9b4---55077531112.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/kipisosenofolusabipiv.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/nobugivagukuravugexipule.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/42867165275.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/bazisinijesatulixesak.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/figofirilewatabefuwatenu.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/voxufiwip.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/53677989824.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/puzarexodonanotoneb.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/53758997425.pdfIn PDF document text
    • http://kleiberit.ru/files/file/wixazub.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/76219850293.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/85567977004.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/13738193937.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/83385656743.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/tegikabalurususuwajimi.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/tokuro.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/tabigoli.pdfIn PDF document text
    • https://hoalavender.net/upload/files/24676216605.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613458f16a0e4---zifit.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/68666619361.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/60261484376.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/sodexebezor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c9cd33139---9170505524.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/49929346168.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/sujemafoxaxe.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_off0000b65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65A 10760 bytes
SHA-256: b617fe5387a0906db30496cea49fa254665785784fda4886b36dbb0dd51ad47a
font_01_sfnt_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 14256 bytes
SHA-256: 598ae88299bb312bb5457c81e32095ebfe16f9f047199f6ab707581024bd71fb
font_02_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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