Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae539ec9b262c1ce…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 09:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3131a02df4dddd194182596a0fb3c816 SHA-1: a3b17b3485f11362de118ca3798e83bba16d9db8 SHA-256: ae539ec9b262c1ced2ec69bca9e4ff71db4eb3436dca1c002c705cd72ca17054
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://drukarnia-warszawa.pl/pliki/file/juzuvexitupupivixube.pdf In PDF document text
    • http://orikon.net/Images_upload/files/dibalopibiropipeti.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/82040953812.pdfIn PDF document text
    • https://aaaxxion.info/images/file/talazevavunuvigoxarose.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/konilazikozitenategozut.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6016fa817adc5d3f67a3eb2b93d6aa59/sodewezuv.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/96662194948.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/46158468221.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/66529714459.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/jasov.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/zuvonubono.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/51980104552.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/48650514282.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/berijirapar.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/ravowovaxufamifolubut.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/keguwasukomezo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133276902196---47857212974.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/61ed209eab4bbd5e64f641e71f684218/zoripijidexet.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/gameluj.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/wapoli.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/5575337182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=atv+launcher+settingsPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/wadep.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_off0000d2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 10536 bytes
SHA-256: 87490c07892bfbf72ee1aa46b6e836764bd6d1371548e6e799de9684b7591d96
font_02_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 17524 bytes
SHA-256: df520f028a7c6c3be3f5f8472a6b9a891bee20221b92ed0fb74843f810f75b69

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