Malicious PDF — malware analysis report

Static analysis result for SHA-256 95699e8f45e60d86…

MALICIOUS

PDF

104.6 KB Created: 2021-09-17 10:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2f86911d9f849d60390be5317da65478 SHA-1: 4b8dc1b0a7c5fa6c79afc5a9665eba1d6ec6e388 SHA-256: 95699e8f45e60d86f10ffecaaae07636a853cdd5e10d7b8d0975b2080e4627bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic further supports a lure-based attack pattern. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the overall structure and heuristics indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=the+night+circus+pdf+download PDF link annotation
    • https://deycaterers.com/ckfinder/userfiles/files/xatejipulepazobogi.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/36915158883.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/giwinidikakaloz.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/88798508421.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/josidufobizowakoxezepipa.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1614123f4b14f6---taponezujuguwixubar.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/migub.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/sonaziximekini.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/76197866586.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/75081038539.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/xogokobub.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/xokakawe.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/89373365132.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/35153100880.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/cg96tig5n15qa5msegmvc1evh2/lababadazava.pdfIn PDF document text
    • http://gibisch.biz/files/files/92405584376.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/zufitubeladoxumojixo.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/xavurogizuzowapibas.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138367862af7---xutuki.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/tititolomakebozejuvadur.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/47864890339.pdfIn PDF document text
    • http://reichspfarrer.sk/file/xisanelimalasufe.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/sinufuxaso.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/gilexadiloboniguguni.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/93053530068.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/6844003396.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_off00013352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13352 11048 bytes
SHA-256: b74812eed6861b329973d3c2836a5613057e36f041d8d13b567c9c4fa9c7a2bc
font_01_sfnt_off00014cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E9 18296 bytes
SHA-256: 11b82c24816cf445a0456cb6a3c8662bfd49163c96ccd027474cd1ec0fbdef36

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