Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d647423a0774e40…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 10:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2601a6e46de65a8a91f70c813dbb10d6 SHA-1: da7e7a6dfe5ec02f094bf87c506f64bf9a4891a9 SHA-256: 1d647423a0774e4061822f726d1a0ab80ae259214448a930890bfbe896930444
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is structured as a link farm to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=wurth+catalogue+pdf+europe PDF link annotation
    • https://prawobrzeze.info/userfiles/file/45677411903.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/98691665552.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/rilobujazufekumopikororur.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/44428914894.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db90d99546---besorak.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/mefufage.pdfIn PDF document text
    • https://faprosid.com/file/30068971826.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/jenirerofit.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160adba5b41aec---49725698607.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125afa5214e5---razomamikuwidifa.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/146df7ec0c0c1905b5de8baaea35dd0a/tugesaveguzanem.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab79e5e6da---91372404914.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d660d70896e---76693789050.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd47bc91b2f---buraxiwa.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/74714304757.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/fezofijede.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/965c1d4ee638c32819e34e3025aa9f07/dezozabenamepejizuse.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/88120674284.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/logakaxupowijobona.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/49c04a888fff425c764de1bd38d158c8/pivuvulomozilajarevowere.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/61469512682.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb10005753---28121573282.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5ntljac7saulenaspmg6hsmqm6/46061597848.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f032057fd7---kunovogod.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D5 17936 bytes
SHA-256: 144f3cd0361592d2ac0868d0b800233b50bd6a9b39e39eb420365fca9eb485c9
font_01_sfnt_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001100d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 10628 bytes
SHA-256: 3e8bba2066dd8e8089e3fed35ec40a02b3b550c605cc456511d9c4cb0a2862b5

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