Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9590ad73466302…

MALICIOUS

PDF

86.1 KB Created: 2021-09-03 18:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03fd0a99e30ef655ee9a8fdf0e60de9e SHA-1: 09fd5a866301dea7cb71b07c595ce7087c2bce28 SHA-256: ac9590ad734663023f7a880f7a4bb73cdb7954fa17ff7c893523da227f9d7715
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites hosting further PDF files. This behavior is indicative of a link farm used to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097fa7ab3073---79510621163.pdf In PDF document text
    • https://dolcezzecaffe.it/file/jabobijaziga.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b25b7c916---37651083862.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609471ceb0aca---wavojaxebamoxumupimiporak.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/tuwetomatogapasavop.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e865bd92f5---sivajedajivinemagu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e86f84352d3690faabfb2e7878690240/73728170642.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/lupipofexuge.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/u06rf52cufe4bf2hus4spj6pgv/15967418674.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072d2fd4de27---zevutokew.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vd9sg2vn54mnsvjn8o556l7dul/gelutisadazebapir.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/wetegube.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/muvudawufuxadom.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210510030307015.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/7325652990.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1c3e18150---lunenojavejulozuseg.pdfIn PDF document text
    • http://heizler.hu/files/file/10719603882.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/ca1e5156c5ed41b356ad3e3bb4b455af/56354566616.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/mezamevepenaduladopalaja.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3457f46962---jetukewodameguxur.pdfIn PDF document text
    • https://hojoairport.com/images/file/84159222635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=red+bull+company+profile+pdfPDF link annotation
    • 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_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 18304 bytes
SHA-256: 98c56fad2ef8f8db3376ace4cd17db0d36ed6c1bc66c98c8565a7919446433d6
font_02_sfnt_off0001319e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319E 10916 bytes
SHA-256: 8308c217cc0805b949bc0bcc1b3f82fb961e62632400ee04beb35023d62938cd

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