Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f154cc927bdaf4…

MALICIOUS

PDF

84.0 KB Created: 2021-07-29 23:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36ec666b85755aabc8477607c2cf052c SHA-1: 68d4ee8e59568698540f16c277c77593b9b88144 SHA-256: f2f154cc927bdaf47e6749ea3ff8680a73aafe74c2ed764378eae25249e8f7ed
104 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised websites, suggesting an attempt to distribute malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document may be disguised as an invoice or payment request to entice users. While no scripts were directly extracted, the ML classifier strongly flags this PDF as malicious, and the overall structure suggests it's designed to exploit users via social engineering and potentially a client-side vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=how+do+you+write+a+budget+request+letter PDF link annotation
    • https://alatheir.com/atheirwsfiles/file/purijusokinixi.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/jixoniroduvipodaled.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kd7kjesm2pk0ipq5h03ai659ua/87224857229.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f451bb299---jibozi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f550487dcf3---57291434066.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5189c031f5---jidefugagepox.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb21631ea47---tifavexupusigipajudalelo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608740c1929b6---jitegetisifiru.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/63511365032.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081899e373ff---jaxojasikigelavufo.pdfIn PDF document text
    • http://freeski.hu/freeski/file/97313522407.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/vokeke.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/fbb59ca7408763d81f530b8b036cbdce/lizijeta.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/86340806056.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/1858336504.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/22599075242.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/vefomigevimunonep.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jazusek.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a036cf6011a---vopetubutesafefixikol.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2c7309ba111a23a19a3b2231e97e8bfb/bizidazunanuditejesowimu.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca5e91c28---bakigokapidoli.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/mbsgdnjkkij0chacb33s3d34r9/pasukedategid.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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 16392 bytes
SHA-256: 526bacfe64dea0c8aac0d1183c657015ce953cd92d915652f903b9c72d756efb
font_01_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 10896 bytes
SHA-256: 2217bc42f74aa0cd3c6c39f4c4c7503ed1c45e9a67906eb044e8cfb194b9d11d
font_02_sfnt_off000128c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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