Malicious PDF — malware analysis report

Static analysis result for SHA-256 64acc472f5ff13b4…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 10:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ef535ce5851a9ff7dabef2495dc34a5f SHA-1: 109c802b30675e94d811f4ff7063b0c2d3fda27f SHA-256: 64acc472f5ff13b432eb9c3976f7a0cf0b66a491b78c6e4e833d53577a05b972
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of 'utm_term' parameters suggests an attempt to track user engagement, common in phishing or spam campaigns. The primary purpose appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=hip+extension+goniometry PDF link annotation
    • https://facade-metal.ch/ckfinder/userfiles/files/pebawidi.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/xarivetasoxe.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/enljvvajgtava9p2a15dbeth62/38218715196.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/29342451656.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc532b3c83---damakudosavixole.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/ritefaguwukom.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/vonavuvufofidit.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611357115c7ed---93885345901.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/wegilofuwuwe.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/60e04f07f39c1be802ca8aaf3dca9526/gugozeluvoke.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/nujexuto.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fb532adce---bopobu.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/84583160661.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/famidejemarufe.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/46662075613.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aeebbe90c2c---vuxabesopixewonegubev.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaba333c2---90984927284.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07c3d5fefb---25417658981.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/98b924b81a823017e0b14a041e4acd3b/87317166123.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/39845263937.pdfIn PDF document text
    • https://msvadba.ru/files/file/sodurogijodiseguroda.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/puxasamutukubanegaxevep.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ca57cf02---vawamorutafim.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/27063798354.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_off0000bf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF54 15684 bytes
SHA-256: 790c4ff6f36e3e5b18610961a64be4757fedbce4853023025a55457adbd897ba
font_01_sfnt_off0000e699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 10592 bytes
SHA-256: 5d8f7c2a74defae78ac4da66312eb1722bddcae38b99f01e6c5f2e0e68b0c1f5

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