Malicious PDF — malware analysis report

Static analysis result for SHA-256 778e1b3f9a051690…

MALICIOUS

PDF

87.3 KB Created: 2021-07-09 09:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d75e0fb830c0e21163cfd17954a43335 SHA-1: 8c08a1c4c2337d5fcba36917070b6b69d37b2545 SHA-256: 778e1b3f9a0516900b40cfe189532466c7762937b37595fd9d49651915ec74e7
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites. The critical heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs users to copy/paste into a shell, suggesting an attempt to execute commands. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or downloader document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=arm+trusted+firmware PDF link annotation
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a803ed90190952a3f31788d8e51d10be/59758927674.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/duvipafemekipejelunesusi.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/76538201690.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/lisexusokudubananorul.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/junegosidegukep.pdfIn PDF document text
    • https://bselink.com/userfiles/file/lorozesubitiwojatokaw.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd6da7ccb---18371260201.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/s9pp916dk330oahu21a5dag05l/tinalukubosumikem.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f678b8a374---tijil.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/befee306499c60f92ba217ef716d48ac/6728525113.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b63e273a53e9906ad7dfb037b870bfe8/21480120564.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160823a6c49877---23390175144.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/wijabuxa.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/kbssec12a6qucckj40uhsu01te/tugano.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/16709445192.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608504c190920---sudavorawukovawiwenize.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3b7b5a447---wifaw.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/nivepijulifojakinolit.pdfIn PDF document text
    • http://surtek.biz/image/files/20150116_151056.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160981e139dfcd---60786701890.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/13607852555.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/165cbdc0b3ba993bdfbcc7f562f66b71/zited.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087fcdd64b3e---85261772057.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/65667201803.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/vabomazez.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcbbe44878---bupimarorogor.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607485484e6c2---97330261274.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 16804 bytes
SHA-256: 4f7afc18785ecbef532f012accd1a375076bd30d757e79238f282a7277ff07d1
font_01_sfnt_off00011334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 10412 bytes
SHA-256: 21385380fdfd9d3aa195082f9944c9c01e7abb676e718d3316130a606776773c
font_02_sfnt_off00012aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000142f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F9 2996 bytes
SHA-256: ed5e5f905d164ae9baa10a7e7f517654ff693f15110276f0e2d5972e09b2ed86

Open this report in the interactive analyzer, or submit your own file for analysis.